People in Royston and surrounding villages are invited to take part in the Rotary Swimathon on Sunday, October 15.
The event will take place between 6pm and 10pm at Royston Leisure Centre in Woodstock Road.
Teams can have up to six members who swim in relay for 55 minutes, aiming to swim as many lengths as possible.
Half of the sponsorship money raised by a team can go to their own chosen charity, while the remainder will be split between the Rotary Club's Charity Fund and Carers in Hertfordshire.
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Organiser Jean Green said: "There’s still an opportunity for anyone wishing to apply for the second session, starting at 7pm."
Full details of the event and application forms are available at www.roystonrotary.com.
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