Register, but be allowed to defer payment until we KNOW we're going. I'm still very peeved that we paid for two groups to go to UIL, it was cancelled, and I don't know if we're getting refunded anything at all.
Everyone ought to understand going in taht it may not happen. Maybe work out a 50/50 plan with the accompanist. 50% for learning the piece, the other 50% if the performance takes place.
It's important to behave in a manner that allows options but all allows that out for safety reasons by either party.