According to Official Guinness Records,
The largest Cadillac parade consisted of 298 Cadillac cars at the Orleans County Fair in Barton, Vermont, USA, on 17 August 2011.
This parade was held in honor of Barton, VT native, Henry M. Leland, inventor of both the Cadillac and Lincoln cars.
For a complete list of 2011 records, please visit 2011 Guinness Records in United States.