A ceremony is an event of ritual significance, performed on a special occasion. The word may be of Etruscan origin.

A ceremony may mark a rite of passage in a human life, marking the significance of, for example:

Sometimes, a ceremony may only be performed by a person with certain authority. For example, the opening of the United Kingdom Parliament is presided over by the Sovereign (Her Majesty Queen Elizabeth II). A captain or a higher-ranked naval officer usually supervises the naming and launching of a warship. A wedding is performed by a priest or a Civil Celebrant, as in Australia. The President of the United States is customarily sworn in by the Chief Justice of the United States, and the British sovereign is always crowned by the Archbishop of Canterbury.

Other, society-wide ceremonies may mark annual or seasonal or recurrent events such as:

Other ceremonies underscore the importance of non-regular special occasions, such as:

In some Asian cultures, ceremonies also play an important social role, for example the tea ceremony.

Leonardo Wilhelm DiCaprio (/dɨˈkæpri.oʊ/; born November 11, 1974) is an American actor and film producer. He has been nominated for the Golden Globe Award eight times as an actor, and won the Golden Globe Award for Best Actor for his performance in The Aviator (2004). He has also been nominated by the Academy Awards, Screen Actors Guild, Satellite Awards, and the British Academy of Film and Television Arts.

Born and raised in Los Angeles, California, DiCaprio started his career by appearing in television commercials prior to landing recurring roles in TV series such as the soap opera Santa Barbara and the sitcom Growing Pains in the early 1990s. He made his film debut in the comedic sci-fi horror film Critters 3 (1991) and received first notable critical praise for his performance in This Boy's Life (1993). DiCaprio obtained recognition for his subsequent work in supporting roles in What's Eating Gilbert Grape (1993) and Marvin's Room (1996), as well as leading roles in The Basketball Diaries (1995) and Romeo + Juliet (1996), before achieving international fame in James Cameron's Titanic (1997).

George Timothy Clooney (born May 6, 1961) is an American actor, film director, producer, and screenwriter. For his work as an actor, he has received three Golden Globe Awards and an Academy Award. Clooney is also noted for his political activism, and has served as one of the United Nations Messengers of Peace since January 31, 2008.

Though he made his acting debut on television in 1978, Clooney gained fame and recognition by portraying Dr. Douglas "Doug" Ross on the long-running medical drama ER from 1994 to 1999. While working on ER, he started attracting a variety of leading roles in films including Batman & Robin (1997) and Out of Sight (1998), in which he first teamed with long-term collaborator Steven Soderbergh. 1999 saw the release of Three Kings, a well-received war satire set during the Gulf War featuring Clooney in another lead role. In 2001, Clooney's fame widened with the release of his biggest commercial success, Ocean's Eleven, the first of a profitable film trilogy, a remake of the film from 1960 with the members of The Rat Pack with Frank Sinatra as Danny Ocean. He made his directorial debut a year later with the 2002 biographical thriller Confessions of a Dangerous Mind, and has since directed Good Night, and Good Luck (2005), Leatherheads (2008), and The Ides of March (2011). He won an Academy Award for Best Supporting Actor for his work in the Middle East thriller Syriana (2005) and subsequently fetched Best Actor nominations for such films as Michael Clayton (2007), Up in the Air (2009) and The Descendants (2011).