According to Official Guinness Records,
The largest Charleston dance consists of 1096 participants, and was achieved by Revel in Dance (UK) at I Can Charleston in Shrewsbury, UK, on 22 September 2018. Revel in Dance undertook this attempt as part of their efforts to raise money for Severn Hospice. They wanted a record that people of all ages could get involved with and get moving.
For a complete list of 2018 records, please visit 2018 Guinness Records in United Kingdom.