Ulley reservoir will be filled with boats on Sunday to help raise cash for the Andrew Simpson Sailing Foundation.
Andrew was a British Olympic sailor winning gold and silver medals for Britain.
He died while training for the America’s Cup in San Francisco Bay in May 2013.
The Andrew Simpson Sailing Foundation was set up in his memory to use sailing to transform the lives of young people.
Named ‘Bart’s Bash’, in memory of Andrew’s nickname, the mass participation event taking place in more than 50 countries will involve sailing races and fundraising activities.
Last year over 30,700 people took part in the event, raising over £360,000 for the charity.
There were 34 boats on Ulley Reservoir and £900 was raised for the charity.
So far 39 sailors have registered for this weekend’s event, which starts at 11.30am.
Participants range from children to pensioners.
In addition to the main race, starting at 11.30am, there will be a members’ launch fun activities and two further races.
The day is expected to finish at 4.30pm with a raffle.
Members of the public are invited to watch the event.