According to Official Guinness Records,
The largest cocktail / mocktail -making lesson consists of 1,879 participants and was achieved by Pudong Shangri-La, East Shanghai (China) in Shanghai, China, on 17 September 2018.The mocktail-making lesson started at 16:14 and finished at 16:45, lasting for 31 minutes. At the end of the lesson, the General Manager of Pudong Shangri-La Hotel and the instructor made a toast and all participants drank the mocktail they made in the lesson.
For a complete list of 2018 records, please visit 2018 Guinness Records in China.