If you do a remotely fun show for kids, you’ve have a kid pee during your show because they’re having too much fun and don’t want to get up, or you make them laugh too hard. The other night I had a kid helping me and she was laughing super hard, she stopped and said, “I just peed”!
This is always a hard thing to navigate, you need to deal with it, but in a way that causes the least amount of attention. In this instance the kid didn’t seem in distress and was remarkably calm, so I said, “we’ll pause this trick and you can take care of it”. She left and got a change of clothes and while she was gone I did another routine. Once she was back, we picked up the routine where we left off.
Oh, I had a paper towel in my case, so I put it on the spot. Not so much to clean it up, but to mark it for me so I knew where it was.

Every time this happens you need to instantly read the situation to know what the appropriate way to handle it is.
-Louie