How about a weekly "food swap" party! Like a used clothing or toy swap, but offering (not so used) food, with people bringing whatever food they happen to have too much of that week, and can take whatever food they want home with them (and no money changing hands, just food, and good company). Not just produce, but anything, including massive quantities of leftover lasagna and pinapple juice from the-party-that-didn't-happen, serious cases of "I live alone and made way more brownies than one human being should ever eat", and the periodic problems of "I just went raw vegan and don't need all this peanut butter and jelly and cans of soup now anybody want 'em?".