Merged in [17712] from rjsparks@nostrum.com:

Add a webcal link to /meetings/upcoming. Partially addresses #2971. Adding this to the main agenda page will require some js juggling, and I think getting some runtime with it first to make sure it is what we want makes sense.
 - Legacy-Id: 17734
Note: SVN reference [17712] has been migrated to Git commit 88b3ae87da

ietf/meeting/views.py

@@ -2672,6 +2672,8 @@ def upcoming(request):
                         reverse('ietf.meeting.views.interim_request')))
     actions.append(('Download as .ics',
                     reverse('ietf.meeting.views.upcoming_ical')))
+    actions.append(('Subscribe with webcal',
+                    'webcal://'+request.get_host()+reverse('ietf.meeting.views.upcoming_ical')))
 
     return render(request, 'meeting/upcoming.html', {
                   'entries': entries,