Hundreds of thousands of people packed the streets of west London Monday for the colorful, calypso-filled Notting Hill Carnival, billed as Europe's largest street festival. Police put the crowd at 500,000, but organizers said 750,000 people attended, including 50,000 who performed in the music and dance parade. Partygoers lined the streets as performers in brightly colored, sparkling costumes paraded through the streets. Many rode atop 84 separate floats, playing calypso and samba music through occasional downpours. Launched in 1964 with a few Trinidadian steel bands, the street carnival has grown into a major event that lures partygoers from all over the world.