Like the United Sates, Canada has lots of running clubs that offer organized events for their members and guests. One of the top sites to search for clubs in Canada and in other countries (as well as in the United States) is The Running Network. They're at:

Running Network, LLC

28 W. Milwaukee St.
P.O. Box 801
Fort Atkinson, WI 53538-0801
Phone: (608) 827-0806