UIL State Marching Band Contest Combo: 4A Prelims/4A Finals brings high school marching bands from across Texas to the Alamodome in San Antonio for the University Interscholastic League's state competition. Expect big drums, bright brass, precision formations and the kind of school spirit that fills a huge stadium. The Alamodome is one of the biggest indoor venues in town, so the sound and energy carry all the way to the top rows.