The Soma Nomaoi is a 1,000-year-old samurai festival featuring horseback riding competitions, mock cavalry battles, and traditional ceremonies. It takes place annually in late July over three days, with Soma Odaka Shrine serving as one of three main venues. Hundreds of riders dressed in authentic samurai armor participate in events including horse races, flag capture competitions called Kacchu-keiba, and the dramatic Shinki Sodatsusen where mounted warriors compete to catch sacred flags launched into the air.