The one last weekend was the 'Classic & Performance Car Spectacular', the one in August is the 'Vintage, Classic & Sports Car' show.
If this weekend's 'giant autojumble' is anything to go by, it'll be 30% genuine auto-jumble stalls with the other 70% made up of shoe, furniture, gardening, sweet, toy, t-shirt, & other miscellaneous stalls.
There's also the North-West regional BMW show on Sunday July 11th.