British Naturism organised the skinny dipping event at Blackpool's Sandcastle Waterpark on Saturday evening – open to all ages.
Over 300 visitors are expected to turn up between 6pm-8pm to take to the slides with their kit off.
The society will even be celebrating its 10th year hosting the event at Sandcastle.
Similar events will also be taking place at WaterWorld in Stoke-on-Trent.
British Naturism was started in Northampton in 1964 and is the UK's internationally recognised organisation for naturism.
The group's Facebook page says it "exists to unite and support naturists, to protect naturist places and provide more, make social nudity more acceptable across the UK".
Sandcastle won't be advertising the event as it's rented out by the society which takes charge of the organisation.
Tickets for this weekend's event cost £21 for adult non members and £5 for children. Under fives go free.
The event will be taking place on the day of an attempted Guinness World Record at Blackpool Pleasure Beach, Manchester Evening News reports.
They're attempting to have the most naked people riding a theme park ride at one time and will all ride the Grand National at 5pm.
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