According to Official Guinness Records,
The largest watermelon eating contest consists of 259 people, and was achieved by the City of Safety Harbor, Florida (USA), in Safety Harbor, Florida, USA, on 1 July 2018.The attempt took place at Melons for Moolah, an event held to raise money for local charities and bring the community together.
For a complete list of 2018 records, please visit 2018 Guinness Records in United States.