If I create an event in a Google calendar in Thunderbird 102.11.2 and the Provider for Google Calendar, it correctly shows me as the organizer with no attendees. The Google Calendar app on my Samsung A13 phone running Android 12 shows it correctly on my calendar. If I then edit the event in Thunderbird and save it (even it I don't make changes), I am listed as an attendee to the meeting as well as the organizer. This causes my phone to show the event with a black interior rather than the normal color for events on my calendar. My presumption is that the black interior means the event hasn't been confirmed by all attendees. If I "remove all attendees" in Thunderbird for the event, my phone shows it correctly again. I saw a similar problem report on the web about Google adding the organizer as an attendee. It said something about being logged in to "the primary" calendar when creating the event on a google calendar, but with no explanation about what the "primary calendar" is, and the description of that problem isn't exactly what is happening to me. Removing all attendees or just living with different colored events on my calendar are viable options, but it is annoying. Any suggestions would be welcome.