Many of the Scent trials available are posted on the Dogs On Source Event page
https://www.facebook.com/groups/557124751088212/

K9 SSG:
A New way to play nose work in Canada! Trials are currently being held in Prince George, the North Okanagan, the Kootenays, the Lower Mainland and Vancouver Island. 
https://k9ssg.com/
Join the Face Book page for current event information. 
https://www.facebook.com/k9ssg/

NACSW Trials USA:
National Association of Canine Scent Work trials and Odour Recognition Tests (ORTs) happen in WA regularly. See the NACSW website for a full listing of events.
http://www.nacsw.net/home

C-WAGS Scent Detective: 
http://www.c-wags.org/scent_detective.html

K9 ABC Games: 
​Learn more about the Games here: 
http://abcgsys.k9abcgames.com
​
SDDA Trials:
Sporting Detection Dog Association trials: Watch for future trials and Detection Odour Tests (DOTS) on the SDDA web site.
http://www.sportingdetectiondogs.ca

If you want to learn about Nose Work, think about volunteering at a trial or a game. (No experience necessary. If you are interested, contact the trial host.)

Another great link to find out about dog events:
Canuck dogs .com