Police received reports of an altercation involving a number of men and women outside Boyes on Front Street Acomb, shortly before 12.40am.
Upon arrival, officers found five men and four women to be involved in the altercation and an assault had also taken place.
A 23 year old man has sustained injuries after being punched and kicked, and a 33 year old man has sustained an injury to his head and hand.
Two men from York, aged 23 and 33, were arrested in connection with the incident. Both men have been released under investigation while enquiries continue.
Anyone who witnessed the incident or who has any information is asked to contact police. Dial 101, press 2 and ask to speak to York Investigation Hub.
Alternatively, Crimestoppers can be contacted anonymously on 0800 555 111.
Please quote reference number 12170231267 when passing on any information.