The Oval Park in Saltdean was full to capacity at a Fun Day which celebrated 75 years of Saltdean Lido.
Around 10,000 people descended on the park on Saturday June 1 and the event looks set to raise about £10,000.
The money will help the Saltdean Lido Community Interest Company (CIC) to progress with the next stages of its bid to run the Lido.
Brighton and Hove City Council owns the art deco site and will make a decision on who will run it at the end of this year.
Saltdean Lido CIC director Rebecca Crook said: “The fun day was a huge success and we really did have a party to celebrate 75 years of the lido.
“We had two fantastic evening events and then the park came alive during the day from dog displays to live music performances.
“The support from local people and businesses in our plight to secure the lido for the community is tremendous and we would like to thank everyone for making the weekend so special. It was very good indeed.
“We have raised thousands which is excellent. The exact amount will be confirmed in the next week.
“We estimate around 10,000 people attended this year. Last year, year 2 of the fun day, around 8,000 people and the first year around 5,000 people. People are now calling it a mini festival.”
Saltdean Lido Community Interest Company, which wants to run the entire lido site for the community and by the community, organised the Fun Day.
The event featured a comedy night on Friday May 31, with Stephen Grant and Zoe Lyons, amongst others.
Visitors on Saturday had a huge choice of activities to enjoy in the warm weather, including Owls and About, live music from Kaz The Forces Sweetheart singing songs from the 30s, a zumba class and swing dance lessons.
East Sussex Reptile and Amphibian Society brought snakes and lizards along, there were fun fair rides and side shows, while in the evening there was music from tribute band Abba Tonight and the Blues Brothers.
Saltdean Lido is the only Grade II star lido in England and in October 2011 it appeared on English Heritage’s Heritage At Risk Register for the first time after years of neglect led to parts of the building becoming derelict.