Comment 60 for bug 810622

(In reply to doberkid from comment #48)
> This seems to work for me:
>
> Adding Calendar Tab:
> Ctrl+Shift+C
> OR
> Events and Tasks menu, then click on Calendar
>
> Making Google the Default Calendar:
> Once Thunderbird starts -> Go to the Calendar tab and Right Click on the
> Google Calendar which you want the events to be processed by
> Click on Properties
> Select the Email -(gmail in this case – the calendar you want to make as
> default for accepting invitations)
> OK-> Close
>
> Hope this helps

Thanks for the steps! Since I posted my last comment above, I did some experimentation and found the following:

If the Google Calendar I have defined in Lightning has the Gmail email address in it, for example:

https://calendar.google.com/calendar/ical/{someaddress%40gmail.com}/private-{some id}/basic.ics

I get prompted for which calendar to add event invitations to. If the Google Calendar defined has the generated calendar ID in it, for example:

https://calendar.google.com/calendar/ical/gb2nmfkrko6l9jo3generated%40group.calendar.google.com/private-47c4accf8a7af8d30cdf6a9bacb123def456/basic.ics

I don't get prompted and the event invitation gets added to the default calendar.

I would prefer to keep my local calendar as the default and be prompted to choose a calendar each time I get an event invitation.