It follows a similar event in Laois last month.
Another sulky race has been intercepted by gardaí in the midlands.
Through a joint operation between Offaly Roads Policing Unit and Tullamore Detective Branch, men from Dublin and Tipperary were found at the event outside Tullamore on Saturday morning.
A number of fixed charge covid fines were issued and the crowd dispersed.
Two men were arrested and 12 fines issued at a similar gathering outside Portlaoise last month.