According to Official Guinness Records,
The largest Basque folk dance is 895 people, achieved by Julen Conde Sarasua (Spain) at Lezo, Guipuzkoa, Spain, on 30 October 2016.Julen Conde Sarasua is the president of the organisation "Betizutik Elkarte Soziokulturala", which aims to potentiate the cultural and linguistic values of their region. The dance performed is called "baile de Muxikos".
For a complete list of 2016 records, please visit 2016 Guinness Records in Spain.