Sign UPS: If you register for a spot, and have to miss it. It will be your job to fill that roster spot and let me know. This way the spot is paid for, and you can sub in and out with friends and can arrange that part on your end if you are away on vacay etc. If you register for the spot, it is your job to pay and then if you need fill-ins then you can discuss with them how to do that.
TEAMS: I will create the roster for each week and when they come, they will get a jersey for that session which will tell them which team they are on. Sometimes I might keep the same teams, sometimes I might switch them so they get to play with players from different teams etc.