The AKC Gazzette is a magazine I'd highly reccomend and they too have an easy to read listing of shows/events.
Do you have a Pembroke? There are plenty of Pembroke breeders/exhibitors out there in the NorthEast and several Specialty (PWC) clubs. I don't remember exactly where you live but here are some links:
Garden State (NJ) Pembroke W. Corgi Club
New England based PWC club:
MD/VA area Club
And finally the National Breed Club...an important site to bookmark.
BTW, Specialty clubs are by "area" and only so many are allowed within certain distances from each other. A Specialty Club might not be right down the road from you. In this case you might also wish to join an all breed club. Many times you have to volunteer, attend events, and get to know people before being allowed to join. Because members vote on important issues, membership is not usually granted randomly but only after a prospective member is known.