Nearly half a million merry costume-clad revelers marked the annual Halloween Costume Carnival in West Hollywood, California Sunday night to celebrate the annual Halloween Costume Carnival in West Hollywood and set a new Guinness record with a song-singing performance. Dubbed the most outrageous Halloween carnival in the world, the 35th annual street party kicked off at 7 p.m. local time (0200 GMT) along the Santa Monica Boulevard. Revelers, dressed as popular movie characters, entertainers and ghosts in creative and quirky costumes, walked down the street as they were cheered on by the crowds. A man dressed in Lady Gaga's meat costume, a blue Navi from the blockbuster 'Avatar,' a demon on stilts, a sweet pair of gingerbread cookies were among the joyful and noisy impersonaters who vied for the spotlight of the festive night. Singer-songwriter John Quale, Prince Poppycock of NBC's ' America's Got Talent,' was crowned the Honorary Mayor of the Carnival. The Carnival celebrated the 35th Anniversary of the cult classic 'Rocky Horror Picture Show' with an attempt to break the Guinness World Record for the largest Time Warp dance across all six performance stages. Organizers say they set a new Guinness Book record with the performance as 8,200 dancers participated in the performance. The Guinness record is less than 1,700 dancers. A huge crowd, numbering anywhere from 150,000 to 400,000, took to the street at the event, the Los Angeles Sheriff's Office said. 'It is not an aggressive event whatsoever. It is visually provocative at times, certainly interesting, but also noisy, but the great thing about it is that it's pretty peaceful,' spokesman Steve Whitmore said. About 400 sheriffs were posted on the scene to keep a lookout, and some of the most advanced technologies have been put into use to guard off potential threats, he added. Members of the West Hollywood City Council led a Carnival March at Santa Monica and La Cienega Boulevards on pedifloats. Only a small number of people were arrested. The arrests generally related to intoxication in public and other minor violations. Two people were treated for minor injuries during the event, said sheriff's Lt. Lawrence Del Mese. Mo major disturbances or incidents were reported during the event which lasted until early Monday morning. The scene returned to normal by 5 a.m. 