MTG Prerelease Theros: Beyond Death 3PM Sun
You can book online for this tournament.
This one's a little different. Players will enter/compete in pairs, the same rules as normal sealed prerelease with a few changes and players will pool their prerelease packs and build two decks out of their pool then use these to compete as teams in a best of 1 format. TL;DR: you're a two headed giant and it's fun smashing other two headed giants.