diff --git a/ietf/static/js/meeting-interim-request.js b/ietf/static/js/meeting-interim-request.js
index 9ba763086..50b899155 100644
--- a/ietf/static/js/meeting-interim-request.js
+++ b/ietf/static/js/meeting-interim-request.js
@@ -1,285 +1,271 @@
-var interimRequest = {
-    // functions for Interim Meeting Request
-    init: function () {
-        // get elements
-        interimRequest.form = $(this);
-        interimRequest.addButton = $('#add_session');
-        interimRequest.inPerson = $('#id_in_person');
-        interimRequest.timezone = $('#id_time_zone');
-        interimRequest.addButton.on("click", interimRequest.addSession);
-        $('.btn-delete')
-            .on("click", interimRequest.deleteSession);
-        interimRequest.inPerson.on("change", interimRequest.toggleLocation);
-        $('input[name="meeting_type"]')
-            .on("change", interimRequest.meetingTypeChanged);
-        $('input[name$="-requested_duration"]')
-            .on("blur", interimRequest.calculateEndTime);
-        $('input[name$="-time"]')
-            .on("blur", interimRequest.calculateEndTime);
-        $('input[name$="-time"]')
-            .on("blur", interimRequest.updateInfo);
-        $('input[name$="-end_time"]')
-            .prop('disabled', true)
-            .on("change", interimRequest.updateInfo);
-        interimRequest.timezone.on("change", interimRequest.timezoneChange);
-        // init
-        interimRequest.inPerson.each(interimRequest.toggleLocation);
-        interimRequest.checkAddButton();
-        interimRequest.initTimezone();
-        $('input[name$="-time"]')
-            .each(interimRequest.calculateEndTime);
-        $('input[name$="-time"]')
-            .each(interimRequest.updateInfo);
-        const remoteParticipations = $('select[id$="-remote_participation"]');
-        remoteParticipations.change(
-          evt => interimRequest.updateRemoteInstructionsVisibility(evt.target)
-        );
-        remoteParticipations.each((index, elt) => interimRequest.updateRemoteInstructionsVisibility(elt));
-    },
+const interimRequest = (function() {
+    'use strict';
+    return {
+        // functions for Interim Meeting Request
+        init: function () {
+            // get elements
+            interimRequest.form = $(this);
+            interimRequest.addButton = $('#add_session');
+            interimRequest.inPerson = $('#id_in_person');
+            interimRequest.timezone = $('#id_time_zone');
+            interimRequest.addButton.on("click", interimRequest.addSession);
+            $('.btn-delete')
+                .on("click", interimRequest.deleteSession);
+            interimRequest.inPerson.on("change", interimRequest.toggleLocation);
+            $('input[name="meeting_type"]')
+                .on("change", interimRequest.meetingTypeChanged);
+            $('input[name$="-requested_duration"]')
+                .on("blur", interimRequest.calculateEndTime);
+            const timeInput = $('input[name$="-time"]');
+            timeInput.on("blur", interimRequest.calculateEndTime);
+            timeInput.on("blur", interimRequest.updateInfo);
+            $('input[name$="-end_time"]')
+                .prop('disabled', true)
+                .on("change", interimRequest.updateInfo);
+            interimRequest.timezone.on("change", interimRequest.timezoneChange);
+            // init
+            interimRequest.inPerson.each(interimRequest.toggleLocation);
+            interimRequest.checkAddButton();
+            interimRequest.initTimezone();
+            timeInput.each(interimRequest.calculateEndTime);
+            timeInput.each(interimRequest.updateInfo);
+            const remoteParticipations = $('select[id$="-remote_participation"]');
+            remoteParticipations.on(
+                'change',
+                evt => interimRequest.updateRemoteInstructionsVisibility(evt.target)
+            );
+            remoteParticipations.each((index, elt) => interimRequest.updateRemoteInstructionsVisibility(elt));
+        },
 
-    addSession: function () {
-        var template = interimRequest.form.find('.fieldset.template');
-        var el = template.clone(true);
-        var totalField = $('#id_session_set-TOTAL_FORMS');
-        var total = +totalField.val();
-        // var meeting_type = $('input[name="meeting_type"]:checked').val();
+        addSession: function () {
+            const template = interimRequest.form.find('.fieldset.template');
+            const el = template.clone(true);
+            const totalField = $('#id_session_set-TOTAL_FORMS');
+            let total = +totalField.val();
+            // var meeting_type = $('input[name="meeting_type"]:checked').val();
 
-        // increment formset counter
-        template.find(':input')
-            .each(function () {
-                var name = $(this)
-                    .attr('name')
-                    .replace('-' + (total - 1) + '-', '-' + total + '-');
-                var id = 'id_' + name;
-                $(this)
-                    .attr({ name: name, id: id })
-                    .val('');
+            // increment formset counter
+            template.find(':input')
+                .each(function () {
+                    const name = $(this)
+                        .attr('name')
+                        .replace('-' + (total - 1) + '-', '-' + total + '-');
+                    const id = 'id_' + name;
+                    $(this)
+                        .attr({ name: name, id: id })
+                        .val('');
+                });
+
+            template.find('label')
+                .each(function () {
+                    const newFor = $(this)
+                        .attr('for')
+                        .replace('-' + (total - 1) + '-', '-' + total + '-');
+                    $(this)
+                        .attr('for', newFor);
+                });
+
+            template.find('div.utc-time')
+                .each(function () {
+                    const newId = $(this)
+                        .attr('id')
+                        .replace('-' + (total - 1) + '-', '-' + total + '-');
+                    $(this)
+                        .attr('id', newId);
+                });
+
+            ++total;
+
+            totalField.val(total);
+
+            template.before(el);
+            el.removeClass("template visually-hidden");
+
+            // copy field contents
+            const first_session = $(".fieldset:first");
+            el.find("input[name$='remote_instructions']")
+                .val(first_session.find("input[name$='remote_instructions']")
+                    .val());
+
+            $('.btn-delete')
+                .removeClass("visually-hidden");
+        },
+
+        updateInfo: function () {
+            // makes ajax call to server and sets UTC field
+            const time = $(this)
+                .val();
+            if (!time) {
+                return;
+            }
+            const url = "/meeting/ajax/get-utc";
+            const fieldset = $(this)
+                .parents(".fieldset");
+            const date = fieldset.find("input[name$='-date']")
+                .val();
+            const timezone = interimRequest.timezone.val();
+            const name = $(this)
+                .attr("id") + "_utc";
+            const utc = fieldset.find("#" + name);
+            //console.log(name,utc.attr("id"));
+            $.ajax({
+                url: url,
+                type: 'GET',
+                cache: false,
+                async: true,
+                dataType: 'json',
+                data: {
+                    date: date,
+                    time: time,
+                    timezone: timezone
+                },
+                success: function (response) {
+                    if (!response.error && response.html) {
+                        utc.html(response.html);
+                    }
+                }
             });
+            return false;
+        },
 
-        template.find('label')
-            .each(function () {
-                var newFor = $(this)
-                    .attr('for')
-                    .replace('-' + (total - 1) + '-', '-' + total + '-');
-                $(this)
-                    .attr('for', newFor);
-            });
+        calculateEndTime: function () {
+            // gets called when either start_time or duration change
+            const fieldset = $(this)
+                .parents(".fieldset");
+            const start_time = fieldset.find("input[name$='-time']");
+            const end_time = fieldset.find("input[name$='-end_time']");
+            const duration = fieldset.find("input[name$='-requested_duration']");
+            if (!start_time.val() || !duration.val()) {
+                return;
+            }
+            const start_values = start_time.val()
+                .split(":");
+            const duration_values = duration.val()
+                .split(":");
+            const d = new Date(2000, 1, 1, start_values[0], start_values[1]);
+            const d1 = new Date(d.getTime() + (duration_values[0] * 60 * 60 * 1000));
+            const d2 = new Date(d1.getTime() + (duration_values[1] * 60 * 1000));
+            end_time.val(interimRequest.get_formatted_time(d2));
+            end_time.trigger('change');
+        },
 
-        template.find('div.utc-time')
-            .each(function () {
-                var newId = $(this)
-                    .attr('id')
-                    .replace('-' + (total - 1) + '-', '-' + total + '-');
-                $(this)
-                    .attr('id', newId);
-            });
+        checkAddButton: function () {
+            const meeting_type = $('input[name="meeting_type"]:checked')
+                .val();
+            if (meeting_type === 'single') {
+                interimRequest.addButton.addClass("visually-hidden");
+            } else {
+                interimRequest.addButton.removeClass("visually-hidden");
+            }
+        },
 
-        ++total;
+        checkInPerson: function () {
+            const meeting_type = $('input[name="meeting_type"]:checked')
+                .val();
+            if (meeting_type === 'series') {
+                interimRequest.inPerson.prop('disabled', true);
+                interimRequest.inPerson.prop('checked', false);
+                interimRequest.toggleLocation();
+            } else {
+                interimRequest.inPerson.prop('disabled', false);
+            }
+        },
 
-        totalField.val(total);
+        initTimezone: function () {
+            if (interimRequest.isEditView()) {
+                // Don't set timezone in edit view, already set
+                return true;
+            }
 
-        template.before(el);
-        el.removeClass("template visually-hidden");
-
-        // copy field contents
-        var first_session = $(".fieldset:first");
-        el.find("input[name$='remote_instructions']")
-            .val(first_session.find("input[name$='remote_instructions']")
-                .val());
-
-        $('.btn-delete')
-            .removeClass("visually-hidden");
-    },
-
-    updateInfo: function () {
-        // makes ajax call to server and sets UTC field
-        var time = $(this)
-            .val();
-        if (!time) {
-            return;
-        }
-        var url = "/meeting/ajax/get-utc";
-        var fieldset = $(this)
-            .parents(".fieldset");
-        var date = fieldset.find("input[name$='-date']")
-            .val();
-        var timezone = interimRequest.timezone.val();
-        var name = $(this)
-            .attr("id") + "_utc";
-        var utc = fieldset.find("#" + name);
-        //console.log(name,utc.attr("id"));
-        $.ajax({
-            url: url,
-            type: 'GET',
-            cache: false,
-            async: true,
-            dataType: 'json',
-            data: {
-                date: date,
-                time: time,
-                timezone: timezone
-            },
-            success: function (response) {
-                if (!response.error && response.html) {
-                    utc.html(response.html);
+            if (window.Intl && typeof window.Intl === "object") {
+                const tzname = Intl.DateTimeFormat()
+                    .resolvedOptions()
+                    .timeZone;
+                if ($('#id_time_zone option[value="' + tzname + '"]')
+                    .length > 0) {
+                    $('#id_time_zone')
+                        .val(tzname);
                 }
             }
-        });
-        return false;
-    },
+        },
 
-    calculateEndTime: function () {
-        // gets called when either start_time or duration change
-        var fieldset = $(this)
-            .parents(".fieldset");
-        var start_time = fieldset.find("input[name$='-time']");
-        var end_time = fieldset.find("input[name$='-end_time']");
-        var duration = fieldset.find("input[name$='-requested_duration']");
-        if (!start_time.val() || !duration.val()) {
-            return;
-        }
-        var start_values = start_time.val()
-            .split(":");
-        var duration_values = duration.val()
-            .split(":");
-        var d = new Date(2000, 1, 1, start_values[0], start_values[1]);
-        var d1 = new Date(d.getTime() + (duration_values[0] * 60 * 60 * 1000));
-        var d2 = new Date(d1.getTime() + (duration_values[1] * 60 * 1000));
-        end_time.val(interimRequest.get_formatted_time(d2));
-        end_time.trigger('change');
-    },
+        get_formatted_time: function (d) {
+            // returns time from Date object as HH:MM
+            const minutes = d.getMinutes()
+                .toString();
+            const hours = d.getHours()
+                .toString();
+            return interimRequest.pad(hours) + ":" + interimRequest.pad(minutes);
+        },
 
-    checkAddButton: function () {
-        var meeting_type = $('input[name="meeting_type"]:checked')
-            .val();
-        if (meeting_type == 'single') {
-            interimRequest.addButton.addClass("visually-hidden");
-        } else {
-            interimRequest.addButton.removeClass("visually-hidden");
-        }
-    },
+        deleteSession: function () {
+            const fieldset = $(this)
+                .parents(".fieldset");
+            fieldset.remove();
+            const totalField = $('#id_form-TOTAL_FORMS');
+            let total = +totalField.val();
+            --total;
+            totalField.val(total);
+            if (total === 2) {
+                $(".btn-delete")
+                    .addClass("visually-hidden");
+            }
+        },
 
-    checkInPerson: function () {
-        var meeting_type = $('input[name="meeting_type"]:checked')
-            .val();
-        if (meeting_type == 'series') {
-            interimRequest.inPerson.prop('disabled', true);
-            interimRequest.inPerson.prop('checked', false);
-            interimRequest.toggleLocation();
-        } else {
-            interimRequest.inPerson.prop('disabled', false);
-        }
-    },
+        isEditView: function () {
+            // Called on init, returns true if editing existing meeting request
+            return !!$('#id_session_set-0-date').val();
+        },
 
-    initTimezone: function () {
-        if (interimRequest.isEditView()) {
-            // Don't set timezone in edit view, already set
-            return true;
-        }
+        meetingTypeChanged: function () {
+            interimRequest.checkAddButton();
+            interimRequest.checkInPerson();
+        },
 
-        if (window.Intl && typeof window.Intl === "object") {
-            var tzname = Intl.DateTimeFormat()
-                .resolvedOptions()
-                .timeZone;
-            if ($('#id_time_zone option[value="' + tzname + '"]')
-                .length > 0) {
-                $('#id_time_zone')
-                    .val(tzname);
+        pad: function (str) {
+            // zero pads string 00
+            if (str.length === 1) {
+                str = "0" + str;
+            }
+            return str;
+        },
+
+        timezoneChange: function () {
+            $("input[name$='-time']")
+                .trigger('blur');
+            $("input[name$='-end_time']")
+                .trigger('change');
+        },
+
+        toggleLocation: function () {
+            if (this.checked) {
+                $(".location")
+                    .prop('disabled', false);
+            } else {
+                $(".location")
+                    .prop('disabled', true);
+            }
+        },
+
+        updateRemoteInstructionsVisibility : function(elt) {
+            const sessionSetPrefix = elt.id.replace('-remote_participation', '');
+            const remoteInstructionsId = sessionSetPrefix + '-remote_instructions';
+            const remoteInstructions = $('#' + remoteInstructionsId);
+
+            switch (elt.value) {
+            case 'meetecho':
+                remoteInstructions.closest('.form-group').hide();
+                break;
+
+            default:
+                remoteInstructions.closest('.form-group').show();
+                break;
             }
         }
-    },
+    };
+})();
 
-    get_formatted_time: function (d) {
-        // returns time from Date object as HH:MM
-        var minutes = d.getMinutes()
-            .toString();
-        var hours = d.getHours()
-            .toString();
-        return interimRequest.pad(hours) + ":" + interimRequest.pad(minutes);
-    },
-
-    deleteSession: function () {
-        var fieldset = $(this)
-            .parents(".fieldset");
-        fieldset.remove();
-        var totalField = $('#id_form-TOTAL_FORMS');
-        var total = +totalField.val();
-        --total;
-        totalField.val(total);
-        if (total == 2) {
-            $(".btn-delete")
-                .addClass("visually-hidden");
-        }
-    },
-
-    get_formatted_utc_time: function (d) {
-        // returns time from Date object as HH:MM
-        var minutes = d.getUTCMinutes()
-            .toString();
-        var hours = d.getUTCHours()
-            .toString();
-        return interimRequest.pad(hours) + ":" + interimRequest.pad(minutes);
-    },
-
-    isEditView: function () {
-        // Called on init, returns true if editing existing meeting request
-        if ($('#id_session_set-0-date')
-            .val()) {
-            return true;
-        } else {
-            return false;
-        }
-    },
-
-    meetingTypeChanged: function () {
-        interimRequest.checkAddButton();
-        interimRequest.checkInPerson();
-    },
-
-    pad: function (str) {
-        // zero pads string 00
-        if (str.length == 1) {
-            str = "0" + str;
-        }
-        return str;
-    },
-
-    timezoneChange: function () {
-        $("input[name$='-time']")
-            .trigger('blur');
-        $("input[name$='-end_time']")
-            .trigger('change');
-    },
-
-    toggleLocation: function () {
-        if (this.checked) {
-            $(".location")
-                .prop('disabled', false);
-        } else {
-            $(".location")
-                .prop('disabled', true);
-        }
-    },
-
-    updateRemoteInstructionsVisibility : function(elt) {
-        const sessionSetPrefix = elt.id.replace('-remote_participation', '');
-        const remoteInstructionsId = sessionSetPrefix + '-remote_instructions';
-        const remoteInstructions = $('#' + remoteInstructionsId);
-
-        switch (elt.value) {
-        case 'meetecho':
-            remoteInstructions.closest('.form-group').hide();
-            break;
-
-        default:
-            remoteInstructions.closest('.form-group').show();
-            break;
-        }
-    }
-};
-
-$(document)
-    .ready(function () {
-        $('#interim-request-form')
-            .each(interimRequest.init);
-    });
\ No newline at end of file
+$(function () {
+    'use strict';
+    $('#interim-request-form').each(interimRequest.init);
+});
\ No newline at end of file