Monmouthshire County Council is looking into six noise complaints about the event, which was held overnight in Chepstow Park Wood and reportedly disturbed residents across a wide area of Monmouthshire. A spokesman for the council said: "The Council is investigating six noise complaints related to the event which are being investigated. The event took place in woodland near Chepstow in the early hours of Sunday 26 July. A spokesman for Gwent Police said: "We received reports of an unlicensed music event in Chepstow Park Wood during the early hours of Sunday 26 July. This is the first public indication of the level of concern raised with the council, which is now investigating the complaints but has not disclosed what action may be taken.