Glen Rock is not near the Delaware Water Gap at all. It's along the Southern border of Eastern Pennsylvania, on the mian highway (I-83) betwen York, Pa. and Baltimore, Md.

Nearby Folk music:

Harrisburg-York area of Pennsylvania:
http://www.sfmsfolk.org/links/folk_links.html#S-E

Also:
Harrisburg, Pennsylvania: http://www.sfmsfolk.org/info/home.html
Baltimore, MD: http://www.bfms.org/
Washington DC: Folklore Cosity of Greater Washington: http://fsgw.org/
Philadelphia: http://www.pfs.org/PFS.php
Wilmington, Delaware area: http://www.delfolk.org/ and http://www.greenwillow.org/index.php