I grew up in Berks County, and recall that back in the day (late '70s) if there wasn't an event going on at the velodrome you could just show up and ride. Can you still do that? I bet a few injuries put a stop to that at some point. We did spend a few afternoons doing laps on road bikes (brakes and all).
I really would like to get there again this summer. Haven't been to the races in a couple of years, but always enjoy it. I live about 300 miles away these days, unfortunately.