See this topic for a change I made to my system:
This obviously shows only the events in the main calendar, or any calendar created by the user_id I entered. I have tried adding private events to such a calendar, in which case the event only shows up in the summary or the current user, so that all works fine.
I was just wondering whether it is possible to have my workaround, AND all calendars belonging to the current user, displayed in the summary. This shouldn't be too hard right?