On 2023-05-16 09:28, Klaus Vink Slott via openSUSE Users wrote:

.. I then notice Thunderbird
could now sync on it's own, but Seamonkey couldn't. The calendars sync, but I have to create the events in the Gmail calendar, using a browser or the Android apps.

and it is not very slow to update? I have not tried it myself, but my wife uses google calendar, and her experience is that it may take hours before updates shared from my calendar, reaches her calendar. (I know that this is most likely another protocol, but

Try clicking on the sync button. I find it works quickly. As I just mentioned, it now appears to be working. Previously, I could create an event from email and it wouldn't even show in the Thunderbird calendar, let alone the Google one.