You will have to check with the London tourist information office as to when this event is on.
It is a street parade, held at Ladbroke Groove, Nottinghill, and a great cultural experience, it is a miniture version of what I would imagine a South American street carnival would look and be like, having not actually been to one, but hearing all about them.
If you are in London, when it is on, it's a great day out, full of vibrant colours, loads of fantastic costumes and music from many different nationalities.
What's great is you get all this for the cost of the train or bus ticket to Nottinghill Gate.
When we went we spent the day, moving and dancing along the sidewalks, following the parade.
Don't take any valuables with you to this venue and only take the money you think you'll need, as with other popular events, pick pockets are out in force.