Mainstage was a Super Smash Bros. Melee and Super Smash Bros. Ultimate national tournament held in Ontario, California, from September 20th-22nd, 2019. It was Beyond the Summit's first major Smash tournament that is not a Smash Summit tournament. The top 6 non-invited players for Ultimate also qualified for Smash Ultimate Summit 2. A live roast of Bobby Scar took place before Melee Top 8.
Super Smash Bros. Melee singles
Super Smash Bros. Melee doubles
Super Smash Bros. Ultimate singles
Super Smash Bros. Ultimate doubles