Crowds of more than 1,000 are expected to watch competitors make a splash at the Hurley Regatta on Saturday, August 17.
The 41st annual regatta will raise money for the Sequela Foundation, a charity that supports people with neurological conditions.
More than 100 people will compete in a day of light-hearted competition that includes a bath race and rescuing a damsel in distress.
The raft building event will see teams assemble and then race their craft.
Organisers will also stage a surprise novelty race, details of which will be kept under wraps until the day of the regatta.
Martin Fry, regatta chairman for the last 15 years, said: "There’s always lots to do on, off and in the water.
"The raft races usually involve a few sinkings and the novelty race is always fun.
"We’re hoping that summer stays around for another week and that many people come along."
Those who wish to stay dry can enjoy see a funfair, face painting, dog racing and an appearance from children’s entertainer Smartyarty.
Irish Folk singer Steve Carroll and the SOAS Ceilidh band will also return and food and drink will be available.
Events start at 9am. The regatta is held in Mill Lane.
Visit hurleyregatta.co.uk for details including entry fees and how to enter races.
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