Do you make your own kombucha? How about kimchee? Or would you prefer to purchase kombucha or kimchee from some random person who — perhaps like yourself — messes around in the kitchen? Greenpoint Food Market, which encourages “DIY methods of food production,” is hosting an open call for vendors: “GFM is currently registering food-makers, musicians, and artists releasing all forms of food expression.” Vendor registration starts at $40. Express your food beginning at noon on Saturday, September 12, at Church of the Messiah (129 Russell Street, near Nassau Avenue).