A £500 reward has been offered following the latest spate of vandalism in Royston park.
The ward alliance has put up the money for anyone who comes forward with information leading to the identification of the perpetrators.
At Royston gala on Sunday, the Barnsley Metropolitan Band had to perform on the grass as the stand was not safe due to the damage to the roof, which Coun Tracey Cheetham said was 'just not the same.'
She said: "The damage was definetely caused over the weekend.
"The stand was fine on Friday, and then when we went down to the gala on Sunday the roof had been smashed in.
"The stand has been vandalised before, and has since been repaired, but this can't keep happening.
"Proms in the Park will be there this summer and people from all over the village and further afield come and sit in the park and have a lovely time, but without the band stand it would just not be the same.
"The ward alliance urges anyone who knows anything about the acts of vandalism to contact the police."