Centre Court is the main court at the Wimbledon Championship, the third annual Grand Slam event of the tennis calendar. It is considered the world's most famous tennis court. It incorporates the clubhouse of the All England Lawn Tennis and Croquet Club. Its only regular use for play is during the two weeks a year that the Championships take place. Centre Court has a premier box for use by the Royal Family and other distinguished guests, and is also known by its postcode SW19.