well they usually gather at the Wawa on 37 or i think there is a white castle or wendy's or something. It's been a while since I hung out in T.R. In a couple of weeks once the warmer weather hits you can check out this website for all the local car cruises and car shows.
www.njcarshow.com
Other then that if you check on here in the central and maybe north section depending on how far you want to drive people set up meets / barbq's all the time.