A man is in a serious condition in hospital after youths gatecrashed an 18th birthday party in Ashford.
Eight others - five men and three women - were also allegedly assaulted at Kennington Women's Institute Hall on Saturday night.
Police have arrested an 18-year-old man and two teenage boys on suspicion of assault and criminal damage following the disturbance.
Officers say the man left seriously injured - who was treated by ambulance crews at the scene - is now in a serious but stable condition in hospital.
A number of windows at the site in Faversham Road, which can be rented out from £15 an hour, have now been boarded up.
On the same night as the party, multiple car wing mirrors were damaged in the area, with vehicles parked in Lower Vicarage Road, Upper Vicarage Road and Church Road all affected.
On the following Monday morning, police were called to a break-in at the post office opposite the WI Hall in Faversham Road.
The alarm had been activated just after 1am and officers found the door had been smashed in, but nothing was reportedly stolen from the premises.
Enquiries are ongoing to find out what happened and the post office has since re-opened.
Witnesses to the attack at the WI hall should call the appeal line on 01843 222289, quoting reference 46/14286/22.
You can also contact Crimestoppers anonymously on 0800 555111, or by using the online form on their website.