There are five main events held at Wimbledon: Gentlemen's Singles, Ladies' Singles, Gentlemen's Doubles, Ladies' Doubles and Mixed Doubles. In addition, four events are held for juniors: Boys' Singles, Girls' Singles, Boys' Doubles and Girls' Doubles. (The Mixed Doubles event is not held at the junior level.) Finally, four invitational events are held: the 35 and over Gentlemen's Invitation Doubles, the 45 and over Gentlemen's Invitation Doubles, the 35 and over Ladies' Invitation Doubles and the Wheelchair Gentlemen's Invitation Doubles.
Matches in the Gentlemen's Singles and Gentlemen's Doubles competitions are best-of-five sets; matches in all other events are best-of-three sets. Most events are single-elimination tournaments; in other words, a player who loses a single match is immediately eliminated from the tournament. However, the 35 and over Gentlemen's Invitation Doubles and the 35 and over Ladies' Invitation Doubles are both round-robin tournaments.
Up through 1921, the winners of the previous year's competition (except in the Ladies Doubles and Mixed Doubles) were automatically granted byes into the final round (then known as the challenge round). This led to many winners retaining their titles for successive years, as they were able to rest while their opponent competed from the start of the competition. From 1922, the title holders played through from the start of the championships.
Each year, the tournament begins on the Monday falling between 20 and 26 June (six weeks before the first Monday in August). It is held two weeks after the Queen's Club Championships, which are considered the major warm-up period for Wimbledon for male players. Another important warm-up tournament for the men is the Gerry Weber Open, which is held in Halle, Germany at about the same time as the Queen's Club Championships. The other grass-court male tournaments before the Championships are currently 's-Hertogenbosch in the Netherlands (which also organises an event for women), and Nottingham in Britain. To adapt to the fast green surface there are also two more competitions for women, the places to host these are Birmingham and Eastbourne (both in the UK). Wimbledon usually lasts for two weeks; the main events span both weeks, but the junior and invitational events are for the most part held during the second week. Traditionally, there is no play on the "Middle Sunday", which is considered a rest day. However, rain has forced play on the Middle Sunday three times in the Championship's history: in 1991, 1997, and 2004. On each of these occasions, Wimbledon has staged a "People's Sunday", with unreserved seating and readily available, inexpensive tickets, allowing those with more limited means to sit on the show courts. Additionally, if the tournament is not completed by the end of the second Sunday, all the remaining matches are postponed until "People's Monday". The grass-court season comes to an end each year after the Championships, when the short tournament of Newport invites male players to its grounds in the U.S.