Natural food co-op Mississippi Market is turning 40 this weekend. The St. Paul grocery shop is throwing a birthday party at its West Seventh location. Food trucks will be serving eats, including Gerhard’s Brats, and Reverie Mobile Kitchen will have gluten-free and vegan options on the menu. Beer will be served from local brewmasters Broken Clock Brewing Cooperative, and, as at any good market party, you’ll find lots of sampling and freebies, here from Izzy’s Ice Cream, Peace Coffee, Organic Valley, Ferndale Market, and Brake Bread. An artists’ tent will showcase works from staffers, and music will be provided by Chris Koza and Seasaw. Kids will be kept busy with arcade games, face painting, and a bouncy castle.