I'm using Google Apps for my domain, and trying to enable access to the Calendar on my website.
The problem is that I get "This feed is read-only" error every time I try to add an event to the calendar.
Here's the url I post to:
https://www.google.com/calendar/feeds/mydomain.com_oaiat5pq6l6dsfnmrodn8susvc%40group.calendar.google.com/private/basic
You're using the basic feed, which according to the documentation is always read-only. Use a feed URL ending in private/full or private/full-noattendees instead.
(Disclaimer: I work for Google, and as part of implementing the calendar side of Google Sync I've had some experience of working with the GData APIs, but anything I write here must be taken to be the views of a private individual rather than as official Google policy etc :)
