Members of Pontypridd Cricket Club are fighting the decision to hold the Ponty's Big Weekend music festival on their grounds.
They say that when the festival was last held at the club six years ago, it left their pitch in poor condition.
Members say the damage done meant that the ground couldn't be used as a county cricket venue.
The festival, which is headlined by Jessie J and Ollie Murs, is a popular event with music lovers and tickets for Saturday and Sunday have already sold out.
Members of the cricket club are concerned that the event will further ruin their grounds, but the Council says the decision needs to be balanced by the financial benefits of the event.
In a statement they said: 'The event already brings £1m worth of additional spend into the town and clearly with the addition of the extra night it increases the economic impact of the event for Pontypridd and the surrounding areas.'