Adding non-FB workout to calendar (FB plus)

Hey guys!

I tried to find this answer somewhere, but I can't seem to find it. I'm wondering if it's possible to add a workout to the calendar that isn't a FB workout. I do a class 2x a week and I don't love just leaving those days blank on. my calendar. I thought I saw at once point that there was a way to do it, but I just can't figure it out.