I went to one in Utica, NY for HS cheer and I found it very helpful. There were many different seminars to take, stunting, cheer, progression, tumbling, motivation etc. It was good to bring another coach to be able to be apart of them all. There were also seminars just for athletes as well! We...
Maybe you have the girls who aren't being declared captain make a video for the incoming captains? Or make large signs and have them posted when they enter the gym.
I've done "captain" bows in the past.
I would advise going to USASF.net & reviewing over levels 1-5. Most teams, but not all are determined based upon tumbling experience and difficulty. Anything under a BHS you would be on Level 1. The skills that are permitted in your level would also be on there as well.
Good luck! Its a fun...