Here are a few links to sites in Canada and around the world that have information about racewalking:

Canandian:
Bytown Walkers (Ottawa)
Kinsman Racewalkers (Edmonton)
London Pacers
Ontario Racewalkers (Toronto)

USA:
Exhaustive listing of US and Other World Racewalk Sites
Racewalk.com
Dave's World Class Racewalking

Athletics Organisations:
BC Athletics
Athletics Alberta
Ontario Track & Field Association
Athletics Canada
Canadian Masters Athletics Association
International AmateurAthletics Federation
World Masters Athletics