The unique competitions held at the New Hampshire Pumpkin Festival include the Great Pumpkin Weigh-Off and various pumpkin-themed contests. Participants showcase their largest pumpkins, competing for awards based on size and creativity. Additionally, there are pumpkin carving competitions that highlight artistic skill. Events like live music, culinary booths featuring pumpkin dishes, and family-friendly activities create a vibrant atmosphere celebrating the harvest season, marking the festival as a significant community event.