See northwestchess.info front page for Grand Prix schedules.
Lynden Youth Chess: https://www.facebook.com/groups/326340470834100/
Bellingham Chess Club, all ages: http://www.bellinghamchess.com/
Information about upcoming scholastic chess tournaments regionally
can be found on a few websites:
For tougher competition and longer, USCF rated games, try the tournaments
at Pacific Northwest Chess Center and Seattle Chess Club.
Tournaments, Quads, Nationals Trainings and Camps at
Orlov Chess Academy, https://chessplayer.com/calendar/ and