I can sympathize that it is hard not knowing ahead of time, but I think this is a really great opportunity for the kids to practice being flexible and knowing how to "adapt to changing conditions".  They may practice their skit one way on their home turf, and then come to the tournament and be in a completely different type of space.  So, if you "plan" for not knowing, you will be as equipped as you can be in the moment to adapt.  They should bring whatever they think they will need and not assume that there will be anything at all available, or that the room will be set up in any certain way.

Good luck!

Sonya