www.contradancelinks.com. Other resources for locating dances nationwide are the contra dance map created by Dwayne Johnson, and Ted Crane's contra dance database, which also contains contact info for bands and callers.
And don't forget to look at the Country Dance and Song Society (CDSS) webpages. You'll find some historical perspective there, as well as information on dance camps, links to related websites, and an online catalog for dance and music.
Looking for a Contra dance? Head over to trycontra.com, enter the zip code and you will get a list of local Contra dances nearby.