Lol. Not a music festival Ally.
It is (or at least was) called the eagle wing festival.
Sort of an American style parade / weekend.
It was never up to much and the music is more a bit of country style.
I live less than tem minutes walk from the village and virtually never go near the festival.
The fireworks have been good in the past.
ALSO. If you do plan to stay in groomsport village the police will move everyone from the harbour as that is where the fieworks are usually launched from.