Thames Valley Police is appealing for witnesses following an incident of grievous bodily harm in Milton Keynes.
The incident happened at around 2.50am on Christmas Day near the taxi rank outside Pink Punters.
Two groups were involved in an altercation, during which the victim, an 18-year-old man, sustained a stab wound to his lower chest.
He was taken to hospital but has since been discharged.
A 20-year-old man from Luton has been arrested on suspicion of section 18 wounding with intent and has been released on bail.
Investigating officer Detective Constable John Swallow, based at Milton Keynes police station, said: “We are appealing to anyone who may have witnessed this incident, or who knows anything about what happened, to please come forward.
“As this happened around the taxi rank area, it is possible that some of this incident may have been captured on dash-cams. Therefore we’d also ask any drivers who were in the vicinity around the time of the incident to please check any footage.
“You can submit footage to us via our dedicated online portal.
“You can also report information by calling 101 or making a report online quoting reference 43220576509.”