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Top Chess Tournaments in the USA and Canada

Chicago Open Chess Tournament (May): www.chesstour.com
US Chess Championship (May): www.uschess.org

Las Vegas Chess Festival (June): www.vegaschessfestival.com
World Open Chess Tournament (July): www.chesstour.com
Canadian Open Chess Tournament (June): www.chess.ca
Quebec Open Chess Tournament (July): www.fqechecs.qc.ca
US Open Chess Tournament (August): www.uschess.org
Canadian Chess Championship (August): www.chess.ca
North American Open Tournament (Dec): www.chesstour.com

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: www.chess.ca
Superfest: chess-math.org

Chess Tournament Calendars

US chess tournaments: main.uschess.org, Click on Play / Upcoming Tournaments
Continental Chess Association: www.chesstour.com
Canadian chess tournaments: www.chess.ca, Click on Select Clubs / Upcoming Tournaments 
Quebec : www.fqechecs.qc.ca, Click on Turnois
FIDE tournaments: www.fide.com/calendar 
ECU chess tournaments: www.europechess.org, Click on Calendar
ECF chess tournaments: www.englishchess.org.uk, Click on Calendar
India : www.aicf.in, Click on Calendar

World chess tournament calendars

www.fide.com/calendar
www.chessmix.com
www.chess-calendar.nl
calendar.avekont.cz