Highlight cells of a training schedule if training start/end dates filled

Hi All,

I'm customizing a calendar template to use it as a training schedule.

I want days in the calendar to be highlighted in certain colors when training information (mostly start/end date & status) are filled in ("training list" tab) through conditional formatting or other solution.

I already have it working for Holidays & priority need to be kept for holidays over the training if 1 is scheduled at the same time.

Any idea to also showcase the customer, training name & instructor in the schedule would be awesome.

Thx in advance.

PS : sample attached