A man was taken to hospital after being bottled in a Rushden pub.
The incident happened in the Rose and Crown pub in High Street, in the early hours of Christmas Eve.
Between 12.10am and 12.50am on Sunday (24 December), a group of men assaulted a woman and two men.
One of the men required hospital treatment after being hit in the face with a bottle.
One of the offenders is described as mixed race, in his early 20s, with hair in a bun and shaved short at the side.
He was wearing a blue shirt.
A second man is described as black, with a stocky build, in his early 20s and wearing dark clothing, and a third man was white, with a stocky build, in his early 20s and wearing a black top and grey jacket.
Witnesses, or anyone with information, are asked to contact Northamptonshire Police on 101.
Alternatively, they can call Crimestoppers anonymously on 0800 555111.