open event; open tournament
Wasei-eigo from 'open game'; used for sports or competitions open to all participants, not by invitation.
wasei-eigo (Japanese-coined English), from open game
This tournament is an open event, so anyone can participate.
exhibition game; preseason game
Used in sports for a friendly or warm-up match that does not affect official standings; similar to オープン戦.
See also: オープン戦
They test new players in preseason games before the season.