Events in O'Fallon — September 2026

Frequently Asked Questions

What's happening in O'Fallon in September 2026?

There are 14 events in O'Fallon, Illinois in September 2026, including Hong Martial Arts – Register Anytime at Katy Cavins Community Center, Vine Street Market at The Station, Last Day for the O'Fallon Aquatic Center in 2026! at Katy Cavins Community Center, Stained Glass – Lead Came Method at Katy Cavins Community Center. Browse the full September 2026 calendar on VenuNite.

Are there free things to do in O'Fallon in September 2026?

Yes — 14 of the listed September 2026 events in O'Fallon are free, including concerts, open mics, and community events. Filter by price on the list above.

How do I find events in O'Fallon for a specific date in September 2026?

VenuNite lists every upcoming event in O'Fallon, Illinois with date filters. Use the date picker on this page to narrow September 2026 down to a single day or weekend.