North Yorkshire Police say it took place in Coney Street in York city centre and a man was elbowed in the face by another man outside Blue Heaven bar and grill.
It happened on Saturday, October 26 between 9.45pm and 10.30pm.
A police spokesman said: "We have already launched an investigation and are now appealing for information from anyone who has yet to come forward.
"If you believe you may have witnessed the incident, please email katie.hicks@northyorkshire.police.uk Alternatively you can call North Yorkshire police on 101 select option 2 and ask for Katie Hicks, or contact Crimestoppers anonymously on 0800 555 111 or via their website."
YOU’LL FIND MORE ON THIS STORY AND OTHERS AT www.yorkpressd.co.uk OR PICK UP YOUR COPY OF THE NEWSPAPER ITSELF AVAILABLE SIX DAYS A WEEK AT YOUR LOCAL NEWSAGENT
York Restaurant Week set to run from Monday March 9
Hit York crime drama Patience to return for third series
York hospice calls for volunteers to help at Malton shop
York firm releases interactive map to help you find best parking spot in city
Road in York is set to close for five days for filming
Man hurt in Euro 2024 violence outside Haxby Sports Bar
Wallace and Gromit and Friends Are Coming to the York Barbican!
Whitby 24-Hour Adult Gaming Centre Approved on Appeal by Inspector
