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Top Chess Tournaments in the USA and Canada

Chicago Open Chess Tournament (May):
US Chess Championship (May):

Las Vegas Chess Festival (June):
World Open Chess Tournament (July):
Canadian Open Chess Tournament (June):
Quebec Open Chess Tournament (July):
US Open Chess Tournament (August):
Canadian Chess Championship (August):
North American Open Tournament (Dec):

Top USCF Scholastic Tournaments

National Youth Action, November
K-12/Collegiate Chess Championship, December
Pan-American Chess Championship, December
Junior Chess Congress, March
Junior High Chess Tournament, April 
High School Chess Tournament, April
Burt Lerner Elementary, May
Denker Tournament of High School Champions, August
Annual Susan Polgar National Invitational for Girls, August

Top Canadian Scholastic Tournaments

Canadian Youth Chess Championship:

Chess Tournament Calendars

US chess tournaments:, Click on Play / Upcoming Tournaments
Continental Chess Association:
Canadian chess tournaments:, Click on Select Clubs / Upcoming Tournaments 
Quebec :, Click on Turnois
FIDE tournaments: 
ECU chess tournaments:, Click on Calendar
ECF chess tournaments:, Click on Calendar
India :, Click on Calendar

World chess tournament calendars