Unable to edit "calendar" field of events with invitees

Question

I am having a couple problems with the "calendar" drop-down field on calendar events.
This is on a 4S, iOS5, syncing calendars with iCloud.
If I create an event with an "invitee" (or add an invitee to an existing event), I can no longer change the "calendar" field of that event.  In fact, the "calendar" drop-down doesn't even appear on the iPhone calendar app's "Edit" dialog for events that have an invitee.  I can still change it via the web interface at www.icloud.com, and the change is even pushed to the iPhone.  But on the iPhone itself, I cannot find a way to change the "calendar" field on an event that contains one or more "invitees".
Second, if I receive an "invitation" from someone else, I cannot find a way specify which of my calendars I want the event on when accepting it.  I would expect it to go to the calendar I have defined as "default" in Settings, but it seems instead to go to the last calendar I created.  And after accepting it, I cannot change it because the "Edit" dialog doesn't display the "calendar" field, as mentioned above.  Again, I can change it via the web interface at www.icloud.com, but cannot find a way to change it directly on the iPhone.
Am I missing some way to edit/change the "calendar" field of an event with invitees?  Or to select which calendar I want events to be on when I "accept" invitations from others?

Answer 1

I have the same problem.  I recently updated to iOS5 and set up syncing through iCloud. 
I was able to add one event into my iphone calendar app, but for the next event that I tried to add, there was no longer the option to choose a calendar and when I tried to add it by tapping "Done," an error message came up: "No calendar is set". and there was no way to select a calendar.
I was able to add the event on my Google Calendar on my laptop (PC), and it synced automatically, but I wasn't able to add any events from the iphone itself because "no calendar is set". 
I tried turning off and on the phone and syncing back to my laptop, but the problem persisted.
I deleted the iCloud account on my iphone, and that seemed to fix the problem; I'm able to add events again from the iphone and it's syncing to my Google Calendar.
I then signed on to iCloud and setup syncing again, but turned off syncing everything except photostream, documents&data, and find my iphone since everything else would sync to outlook or internet explorer, neither of which I use.
That might have been the problem.  For PC, iCloud will only sync to Outlook and Internet Explorer, and I don't have Outlook setup (can't connect to my work's email server with my account and the IT guys don't know how to fix it or they're too lazy to troubleshoot) and I only use Firefox and Chrome.  Since iCloud isn't syncing to any calendars on Outlook, there aren't any calendars set...
I just did this a minute ago and everything seems to be back to normal, including the ability to choose a calendar when adding events.
I'll have to see if it the problem comes back