Celebrate the most popular produce of the fall season, the pumpkin! Operation Pumpkin held in historic downtown Hamilton, Ohio is a pumpkin and art festival held each year in the fall. Pumpkins are sculpted, carved, decorated and eaten all weekend long! See the largest pumpkins you've ever seen at the giant pumpkin weigh-off. This fall festival is packed with crafts, live music, pumpkin vendors and rides for kids.