Give chefs a chance to come up with a costume and you know a good time is going to be had. It's the Green City Market Junior Board's Halloween Harvest Ball, a costume party with food and drink from some of Chicago's best chefs, mixologists and sommeliers, including Mark Mendez (Vera), John Manion (La Sirena Clandestina), Ryan Poli (Tavernita), the Sheerin Brothers (the Trenchermen), Dana Cree (Blackbird), Matthias Merges (Yusho), Jason Wagner (RM Champagne Salon) and more. (You can see last year's here.) It's October 28; tickets are $75 ($65 for Green City Market members) and proceeds will benefit the LINK card matching program at the market. Go here for more information and tickets.