According to Official Guinness Records,
The largest organ donation awareness lesson has 3,005 participants, achieved at an event organised by Department of Health & Family Welfare-Govt. of Tamil Nadu, Transtan and Chair YDC (all India), in Tamil Nadu, India, on 24 October 2018.This is the fourth successful attempt at setting this record.
For a complete list of 2018 records, please visit 2018 Guinness Records in India.