The Olympic oath is obliged at the opening ceremony. Usually is it a veteran (sometimes someone else) from the host country who take the oath. But how goes an oath?

• The one who take the oath mounts the speaking-platform (that's where the microphone stands)
• He/She takes a tip of the flag from the host country in his left hand and raises his right hand
• All the flag bearers are standing around him/her in a half circle
• He/She says the oath:
  "In the name of all the competitors I promise that we shall take part in these Olympic Games, respecting and abiding by the rules which govern them, in the true spirit of sportmanship, for the glory of sport and the honor of our teams."

That is the text of the athletes' oath, but from the original Olympic oath (which was said in 1920 for the first time and became later on the athletes' oath) was the text:
"We swear that we will take part in the Olympic Games in a spirit of chivalry, for the honor of our country and for the glory of our sport."
In 1961 was "swear" replaced by "promise" and "the honor of our countries" became "the honor of our teams".

The Olympic / athletes' oath was taken through:

Summer Olympics	Name	Sport
1920	Victor Boin	water polo player / fencer
1924	Georges André	athlete
1928	Harry Denis	soccer-player
1932	George Calnan	fencer
1936	Rudolf Ismayr	weight lifter
1948	Donald Finlay	athlete
1952	Heikki Savolainen	gymnast
1956	John Landy	athlete
1960	Adolfo Consolini	athlete
1964	Takshi Ono	gymnast
1968	Pablo Garrido	athlete
1972	Heidi Schüller	athlete
1976	Pierre St. Jean	weight lifter
1980	Nikilaj Andrianov	gymnast
1984	Edwin Moses	athlete
1988	Hur Jae	basketball player
1992	Luis Doreste Blanco	sailer
Winter Olympics	Name	Sport
1924	All flag bearers
1928	Hans Eidenbenz	skier
1932	Jack Shea	skater
1936	Wilhelm Bogner	skier
1948	Richard Rorriani	ice hockey player
1952	Torbjörn Falkanger	ski-jumper
1956	Guiliana Chenal-Minuzzo *	skier
1960	Carol Heiss	figure-skater
1964	Paul Aste	bobsledder
1968	Leo Lacroix	skier
1972	Keichi Suzuki	skater
1976	Werner Delle-Barth	bobsledder
1980	Eric Heiden	skater
1984	Bojan Krizaj	skier
1988	Pierre Harvey	skier
1992	Surya Bonaly	figure-skater
1994	Vegard Ulvang	cross-country skier
1998	Keni Ogiwara	??
* the first woman in history who took the Olympic Oath

Since 1972 is there a judges oath with the text:
"In the name of all the judges and officials, I promise that we shall officiate in these Olympic Games with complete impartiality, respecting and abiding by the rules which govern them, in the true spirit of sportmanship."
We have the texts from the oaths from: S.E.A. Multimedia Olympic Gold

the Olympic Fire

The Olympic Fire was lighted for the first time in Amsterdam in 1928 and since then it has burnt from the beginning to the end of each Olympics. The fire symbolizes the movements towards perfection and the wrestle (say torture) to win the golden medal.

The torche-estafette from the old city Olympia to the host city was established in 1936 (and for the Winter Olympics in 1964). The first time that the Olympic fire had to travel by plane was in 1956 for the Olympics in Melbourne.

The fire was lighted by:

Summer Olympics	Name	Sport
1936	Fritz Schiegen	athlete
1948	John Mark	athlete
1952	Paavo Nurmi Hannes Kolehmainen at the tower	athlete ??
1956	Ronald Clarke	athlete
1960	Giancarlo Peris	athlete
1964	Yoshinori Sakai	??
1968	Norma Enriquetta Basilio Sotelo	athlete
1972	Günter Zahn	athlete
1976	Stéphane Préfontaine Sandra Henderson	?? ??
1980	Sergej Belov	basketball player
1984	Rafer Johnson	??
1988	Sun-Man Ching Won-Tuk Kim Mi-Chung Sohn	?? ?? ??
1992	Antoño Rebollo	??
Winter Olympics	Name	Sport
1948	Richard Torriani	ice hockey player
1952	Eigil Nansen	skier
1956	Guido Caroli	skater
1960	Kenneth Henry	skater
1964	Josef Rieder	skier
1968	Alain Calmat	figure-skater
1972	Hideki Takada	skater
1976	Josef Feistmantl Christl Haas	sledder skier
1980	Dr. Charles Morgan Kerr	??
1998	Midori Ito	??