Get in touch with Tom Bamrick; his contact info can be found here:
https://thearcmontgomerycounty.org/connect/messages-from-the-ceo.html
I recommend contacting him via email. He moves about the building throughout the day, especially during the summer, when their programming keeps everyone very engaged (in a good way--they have SO MUCH fun stuff for the kids).
Based on our experience, the waitlist moves faster for kids 2 years and up, probably months vs years. Good luck!