Minnis Recreation Center: 405 297 1432 OKC Park's Annual Halloween Harvest is a spooktacular celebration that brings together families and friends for a night of festive fun. Held from 5 pm to 8 pm on October 31, this free come-and-go event transforms the Center into a Halloween haven filled with treats, games, and glowing surprises. This is a great place for families in NE OKC to celebrate Halloween with themed activities and creative stations for little ghouls and goblins.