Shamrock Fighting Championships returns to the Ameristar Casino in St. Charles on Saturday, May 30 for its 375th event, headlined by a welterweight main event between Kansas-based Austin Spangler and Colorado's Edwin Chavez. Spangler (4-1), who trains at Marathon MMA in Kansas, enters ranked fifth among professional welterweights in the Midwest according to Tapology. His opponent, Edwin Chavez (7-5) of Colorado, holds the third-ranked spot among professional lightweights in his home state. The bout tops a full card of professional and amateur mixed martial arts. The event number itself tells a story. Jesse Finney started this promotion in 1998, not as a businessman, but as a fighter trying to build something for other fighters in the Midwest. He called it Shamrock Promotions, ran kickboxing shows, and grew it card by card into one of the longest-running regional MMA promotions in the United States. By the time Shamrock FC reaches 375, it will have sent more than 200 alumni to the UFC, including Neil Magny, Evan Elder, Darius Flowers, and Garrett Armfield. The Ameristar Casino has been one of Shamrock FC's flagship venues for years, drawing consistent crowds from across Missouri and Kansas. The promotion has held partnerships with Bellator MMA, offering championship winners multi-fight contracts, and broadcasts events internationally through MILLIONS. For fighters like Spangler and Chavez, a Shamrock FC main event is a measurable step. The promotion's track record makes the résumé line mean something. "375 events and we're still putting the best regional talent in front of a real crowd in a real venue," said Jesse Finney, founder and promoter of Shamrock FC. "Austin and Edwin are both ranked, both hungry, and this fight has all the makings of a main event that people will be talking about. That's what Shamrock FC has always been about, giving fighters a stage and letting them do what they do." Shamrock FC 375 streams live on MILLIONS for fans who cannot attend in person. Event Details Event: Shamrock FC 375 Date: May 30, 2026 Time: 7:30pm CT Venue: Ameristar Casino, St. Charles, MO. Get Tickets Watch Shamrock FC 375 on MILLIONS About MILLIONS MILLIONS (millions.co) is a sports media and commerce platform built for live pay-per-view events. The platform gives promoters a direct channel to fans worldwide, streaming live combat sports programming with built-in ticketing, merchandise, and athlete commerce tools. Media Contact: media@millions.co