I got this from an article that was written in February - calling ahead before each show is probably wise as things are bound to change over the months.

March 22 VW Cruise In, 11 a.m.
March 29 N.W.MOTORING.COM Spring Fling, 11 a.m.
April 12 Third annual All Emergency Vehicles Show
April 25 Vintage Military Vehicles Show, 11 a.m.
April 26 All Italian Car Show
May 17 Spring Opening Car Show
May 24 Old Rides Car Show
May 31 Ethyl Forever Car Show
June 7 Eighth annual BMW E30 Picnic
June 14 Blvd. CC Custom Car Show
June 21 Fenders on Front Street & Cruise
July 5 Old Trucks, Buses, Station Wagons
July 12 All Camaro and Chevy Show
July 19 Burgers & Bikes of all types
July 26 Cascade Cougar Club Prowl
Aug. 2 NW Corvair & Orphaned Cars
Aug. 9 NW Muscle Car Show
Aug. 16 NWCCC 55, 56, 57 Chevy Show
Aug. 23 All Corvette Show
Aug. 30 Second annual Rat Bastards Rat Rod Show
Sept. 6 Mega Cruz Car Show
Sept. 13 Third annual All Ford Car Show
Sept. 20 Mopar and More
Sept. 27 First Mini Cooper Show
Oct. 11 Magnums, Chargers, 300s & Challengers, noon
Oct. 25 PT Cruisers Pumpkin Bash, 10 a.m.
Dec. 6 Eighth annual Jingle Bell Cruz/Toys for Tots, noon