So I came up with a plan that I'm not going to take out this year unless I need it, but it worked for the group I had last year, so I thought I'd share! I had 2 clothes pins. One labeled "boys" one labeled "girls". I attached them to my clothes each morning. Anytime anyone had to use the restroom, they had to come ask me (Yes, I know- I really had kids asking me to go to the bathroom 257 times a day which I normally don't do, but this group needed it). If I had the clothes pin, I attached it to their clothes and they went happily on their way. If not, they needed to wait. When they returned, they unhooked the pin and I reattached for the next kid. Voila- bathroom issues solved!
Oh side note: You have to attach the pin to the TOP of their clothes, I usually attached it to the sleeve of a short sleeve shirt or the collar. If it's anywhere else, I don't even want to think about the bathroom nastiness that will come back on that thing.
How do you handle bathroom issues?