If you don't want a source event to be blocked on your destination calendar, simply add the
#nosync hashtag to the Description field of the source event.
Here's an example of what that would looks like in practice:
Note: Others might be able to see the
#nosync in the Description field if they have access to viewing details about your source calendar.
Add #nosync tag to Out of Office event
If you use an "out of office" event in Google Calendar, there is no description field. In this case, add the #nosync hashtag on the title instead.