Gravity Grand Prix The Gravity Grand Prix is an annual fun and fund raising event that has taken place in the Village of Cookham Dean in Berkshire since 2007. It's a downhill race driven just by gravity, except for a short push at the start. This year's event will take place in Cookham Dean on Sunday 1st September. Over the 12 years, it's become a really fun afternoon that can be watched, free, by all the family whilst they do all sorts of things to raise money and create enjoyment. The amazing bonus is the ingenuity of the karts that have been built. They are something to behold, as you will see from the slideshow and the video on their website below. For more information please visit the Gravity Grand Prix website.