See northwestchess.info front page for Grand Prix schedules.
Other links:
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:
https://chessreg.com/
https://nwchess.com/OnlineRegistration/
https://www.wachess.com/calendar
https://nwchess.com/calendar/index.htm#Scholastic%20Events
https://www.calendarwiz.com/calendars/calendar.php?crd=nwsrsevents
For tougher competition and longer, USCF rated games, try the tournaments
at Pacific Northwest Chess Center and Seattle Chess Club.
PNWCC: https://www.pnwchesscenter.org/
SCC: https://seattlechess.club/
Tournaments, Quads, Nationals Trainings and Camps at
Orlov Chess Academy, https://chessplayer.com/calendar/ and
Chess4Life, https://chess4life.com/