No such rules for us. Every year our gym has a ‘fun’ meet where there are team activities in the town the meet is held. This year there was a pool party the night before the level 3’s (and 8’s?) competed. I did choose to not to have my child attend (not because of the swimming) but because she does not sleep well in hotel rooms, is only 8, and swimming late plus no sleep would be disastrous for her in general. Our gym is generally very hands off when it comes to what gymnasts can and cannot do.