Calendar queries

I am new to FB Plus. I have a macbook air and I know I can not integrate the workouts into my ICAL but I can use the FB calendar. What I wanted to do was choose a few programs simultaneously to put in the calendar so that when the date pops up I can have a choice. I just tried to do this but it did not work and I am unsure of my error. Suggestions welcome. I have just done a few days of workouts and I am grateful for this option during Covid when I can't swim at the y!