Billy Pemberton, a painter and decorator from Rotherham, also admitted violent disorder charges and possession of an offensive weapon in relation to picking up a police baton.
Pemberton, 31, of Rosehill Road in Rawmarsh, was remanded into custody and is due to be sentenced on Wednesday.
Meanwhile, Elliot Wragg, 23, of Assembly Way in Barnsley, Glyn Guest of Pearson Crescent in Wombwell, and Trevor Lloyd, 49, of Oak Avenue in Wath upon Dearne, all pleaded guilty to using or threatening to use unlawful violence.
All three were remanded into custody and are due to be sentenced at Sheffield Crown Court on either Tuesday or Wednesday.
Also at Sheffield Magistrates’ Court on Monday, Peter Lynch, 61, of Burman Road in Wath upon Dearne, admitted a charge of violent disorder at the hotel in Manvers.
The court heard Lynch had made inappropriate comments and appeared to be encouraging others to commit violent disorder.
He also pushed a police officer “in retaliation” after being asked to step back and being pushed by an officer.
Lynch is due be sentenced at Sheffield Crown Court on Wednesday.
