busy calendar view

is it possible to put a special color e.g for busy ressources.

in detail i use 5 different sections in timeline view.
i want to mark (e.g in a minicalender ) all dates in red where all sections are busy (all sections already have an event)

is there a already known solution or should i check every section for every day and if all sections are full --> colorize a minicalender


That would be the correct approach.
You can get list of events for specific timespan as
scheduler.getEvents(start_date, end_date);
Then you can loop through it and check if each resource have an event and then apply your logic to that information.

Kind regards,