The incident happened at the West Riding Hotel in Castle Street, Scarborough, at 9.07pm on June 29.
North Yorkshire Police said it involved a staff member getting violently pushed.
Officers are now seeking the identity of the man in the CCTV image, as they believe he may have information that could help them with their investigation.
They’re asking people to email jamie.hussain@northyorkshire.police.uk if you can help.
Alternatively, you can call North Yorkshire Police on 101, select option 2 and ask for Jamie Hussain, or contact Crimestoppers anonymously on 0800 555 111 or via their website.
Please quote reference 12240115505 when passing on information.
