Just a head's up that Google Calendars is experiencing a serious bug right now with respect to the interaction of multiple Google Calendars. When you try to move an existing event to another calendar, Google Calendar duplicates the event and you end up with those annoying "invitation" icons on your event. If you try to delete one of the events, they BOTH get deleted.

This is not a WebOS problem....it is a Google problem and it has the potential to make a mess of my multiple calendar system which I run for both work and personal!!!!

Here is the thread in the Google support forum:

Calendar prompting invites to guests when I don't want them - Calendar Help