Why yes, there are things happening this weekend that don’t relate to Halloween. Two cool picks that piqued my interest? The Boston Vegetarian Food Festival (Saturday & Sunday) will assemble natural food providers, speakers, chefs, and exhibitors offering food samples, demos, learning opportunities, and a children's activity center. And on Sunday, Design Hive is calling all vintage vixens to Cambridge to stock up on vintage clothing, accessories, and home furnishings from local sellers.