All skill levels. There are three Divisions:
Majors (highest), Major/Minor (middle), Minors (lowest)
Subdivision: from A (highest) to E (lowest)
Tournaments are all-day events for either 1 or 2 days. Teams are seeded into pools and play two sets per match. There are approximately four matches per day, depending on pool size.
For 1 day events, teams are pre-seeded into pools for playoffs. For 2 day events, the first day is round robin pool play and the second day is playoffs. Other formats may be used as needed.
These include the popular Chinese New Year Tournament, Las Vegas Invitational, San Diego Invitational, and various Holiday Invitationals (Halloween, Christmas).