Merry Mayhem Market is a high-energy indoor holiday destination built for people who truly love the magic of the season. Spanning 50,000 square feet inside the Steel Athletic Center in St. Charles, MO, this immersive event brings together 200 booths filled with incredible vendors, festive shopping, and nonstop holiday spirit. With photo ops with Santa, curated experiences, and an atmosphere designed to feel alive, Merry Mayhem is where traditions begin and memories are made.