There is a group about 3.5 hrs about 200 miles from you in Hamburg,NY near Buffalo. Contact Marty Moleski on the NSRCA website (nsrca.org). He is listed as one of the webmasters. They have a contest there the weekend of 7/9-7/10. Here are some other contests within 6 hrs of Beavers Falls, PA. Check the NSRCA website for more details.

Sayre,Pa - 8/6-8/7 (315 mi, 6 hrs)
Marshalls Creek, PA - 6/25-6/26 (Delaware Water Gap) (342 miles, 6hrs) I am Co-CD.
Arcola, VA - dates ?? Contact Don Szczur. (272 miles, 5.33 hrs)
Quincy, OH - 8/13 (250 miles, 5 hrs)

There is also a contest weekend of 6/11 in Muncie(AMA site). About 6.5 hrs

Distance and time appproximate using Street Atlas USA.