I always recommend that all kids age 10, 11, 12, register and get a wrist band for the club/lab, even if they're abosultely sure that they aren't going to go anywhere near it. Reason: they go to Edge and make friends with kids the same age. Those friends are registered. Sometimes they decide they want to go between both for whatever reason. The child that isn't registered and doesn't have a wristband then can't be let into the club/lab with their friends even though they are the right age.
At the end of the day, yes it's $13 for a wristband, but once it's returned that charge is returned to you.