The annual USASevens international rugby tournament is the premier rugby event in North America. The Las Vegas tournament is the fifth event out of ten in the HSBC Sevens World Series featuring 16 international rugby sevens teams competing in 45 matches during a three-day competition in an attempt to gain points in the Sevens World Series standings. Played on the same size field as traditional 15-player rugby, rugby sevens is played with just seven players per team. Matches have seven-minute halves with two-minute intervals for pool and knock-out matches. The fast pace and short duration of matches make every moment action thrilling for spectators.
Rugby Sevens tournaments are also huge parties, maybe the biggest in sports, sort of the Super Bowl crossed with the Kentucky Derby crossed with Mardi Gras. – Forbes