North American Bridge Championships (NABC) are three annual bridge tournaments sponsored by the American Contract Bridge League (ACBL). The "Spring", "Summer", and "Fall" NABCs are usually scheduled in March, July, and November for about eleven days. They comprise both championship and side contests of different kinds (e.g. matchpoint pairs and knockout teams, one-day and two-day) in many classes of competition (e.g. open/women/senior or defined by masterpoints®). Host cities in the United States and Canada are selected several years in advance.