Details of the Cowes Classic event are here.
I think the three races Cookee will be competing in are:
Friday 26 th August
14:30–15:30 Race 3 RYA National RIB Championship
Saturday 27 th August
11:15-12:15(?) Race 6 RYA National RIB Championship
Sunday 28 th August
11:15-12:45 Race 10 Gillette MACH3 NITRO Gel Isle of Wight Powerboat Challenge (Race Class)
for maps of where the racing will take place. Basically, the first two races will be run in the Solent to the North and West of Cowes, whilst the last race is 'Round the Island' anticlockwise.
Good luck to everyone competing!