I'm not sure what the closest would be but you can check out ISS New England (Rhode Island) in July
Imprinted Sportswear Shows - New England Also, there is an Atlantic City, NJ show in March. I've attended the AC show the last six years and it was particularily helpful the first few years. If you go talk to as many vendors as you can. You'll learn more and get more freebies. Take classes if you can.