HAT TOURNAMENT (Wikipedia)
Hat tournaments are common in the ultimate circuit. They are tournaments where players join individually rather than as a team. The tournament organizers form teams by randomly taking the names of the participants from a hat.
However, in some tournaments, the organizers do not actually use a hat, but form teams taking into account skill, experience, sex, age, height, and fitness level of the players in the attempt to form teams of even strength. A player provides this information when he or she signs up to enter the tournament.
In both hat leagues and hat tournaments, there is an emphasis on forming new connections throughout the ultimate community. Hat tournaments have a strong emphasis on having fun, socializing, and meeting other players. Players of all levels take part in such events from world-class players to complete beginners. The tournaments (and sometimes also regular tournaments) often have a theme, such as wild west, aliens, pirates, superheroes, etc. The organizers often name teams also according to a theme, such as movie characters, etc.