Halloween Havoc O Fallon Il 2024 Dates. Halloween 2024 events near o fallon, illinois. Street carnivals, ghost tours, family friendly events, spooky costume parties, pub crawls, eerie o fallon, illinois attractions, halloween.

Decorate a team pumpkin any way you wish. The downtown district in o’fallon has resumed hosting activities geared towards autumn and halloween, with a returning witches and wizards event saturday, oct.