The Notting Hill Carnival is a two day street festival held in West London which has been going since 1966.
The carnival route is about 20 miles long. In 2010 around 1.5 million people visited the carnival over two days.
The carnival is expected to start at 9am and finishes at 7pm.
This year 4,500 extra police officers will be on duty to keep the carnival peaceful after the riots at the start of August.
Calypso musicians and steelband performers are another key part of the carnival keeping up the historic ties with the Caribbean.
The carnival is made up of five different areas. Masquerade bands make up a lot of the carnival - they're the people who wear colourful costumes.
The carnival lasts for two days over the August Bank Holiday weekend. The Sunday is always children's day where prizes are awarded for the best costumes.
The organisers of the first carnivals were from the West Indian community living in the Notting Hill area of London - now the carnival represents all of the Caribbean communities.
The very first carnival was set up to showcase the steel band musicians who played parts of London every weekend. When the bands marched through the streets of Notting Hill, people living in the area came out to see because it reminded them of the Caribbean homes they had left behind.
The Notting Hill carnival is Europe's biggest street festival which has been going since 1966.