I called to see if they take appointments, the girl said "no". Which is totally fine. She then informed me that the wait was currently two hours but I could come put my child's name on the list and go do something for 2 hours. So I asked if I could just put his name on the list over the phone (since it's 20 minutes from our house and I also have a very young infant)... She said no, that I would have to come in... So you want me to drive there just to put him on the list? Totally stupid.
If you're concerned with no-shows, ask for a deposit. Don't ask busy parents to waste their time. Very bad idea in their part. I'm sure I'm not the only parent who decided go elsewhere.