Over 100 athletes and almost 700 members of the media are due to attend the United States Olympic Committee (USOC) Media Summit beginning here tomorrow, including the most decorated Olympian of all time in swimmer Michael Phelps.

Phelps, an 18-time gold medal winner across the Athens 2004, Beijing 2008 and London 2012 Games, will participate in a dinner and demonstration event at UCLA on Tuesday (March 8) evening.

The 30-year-old, who retired in 2012 before returning to the pool two years later, missed last year's World Championships after being handed a six month ban by USA Swimming after he was arrested for driving under the influence of alcohol and speeding charges.

He will be joined by seven other leading swimmers who are all speaking tomorrow morning, including arch-rival and team-mate Ryan Lochte, the five-time Olympic and 18-time world champion.

Four-time Olympic champion Missy Franklin will also appear along with Natalie Coughlin, a 12-time Olympic medallist set to compete at a fourth Games in Rio de Janeiro.

The swimmers will headline the opening morning of the three-day event

A USOC leadership briefing will also take place tomorrow, attended by chairman Larry Probst and chief executive Scott Blackmun.

International Paralympic Committee (IPC) President Sir Philip Craven will also be present in order to coincide with exactly six months to go until the Paralympic Games begin.

He will appear alongside wheechair racing legend Tatyana McFadden, who won three gold medals at London 2012.

In total, 27 sports will be represented here for an event considered key in drumming up publicity for an Olympic Games.

Ten-time world gymnastics champion Simone Biles will be another leading figure speaking tomorrow, appearing alongside team-mates Gabby Douglas, Madison Kocian, Danell Leyva, Sam Mikulak, Maggie Nichols, Aly Raisman and Donnell Whittenburg.

Some of United States' leading athletics stars will also feature, including decathlon world record holder Ashton Eaton and sprinter Alyson Felix, who is targeting a 200 and 400 metres double next year.

The event was originally due to be held in Boston before being shifted across the country after Los Angeles replaced Boston as the US bid for the 2024 Olympics and Paralympics last year.

USOC chief external affairs officer Patrick Sandusky spoke to open the summit at a reception this evening.

Los Angeles 2024 chief communications officer Jeff Millman also spoke before unveiling a special promotional video featuring actor Will Ferrell and actress and model Jessica Alba in which the city and bid was showcased.

United States won 46 gold, 28 silver and 29 bronze medals at London 2012, finishing top of the medals table both in terms of gold medals and total podium finishes.