A 54-year-old man is said to be in a critical condition in hospital following an incident outside the Pen-y-Bont pub in Abergele.
Police say a man and woman, both local to the area, have been arrested.
Officers are now seeking witnesses to the incident, which is understood to have happened at around 10:30pm on Thursday.
More top news
A dry night with mist possible in places. Feeling very warm!
Business Secretary Greg Clark said the UK Government was not prepared to back the Swansea Bay tidal lagoon project.
The pair met after Sheeran's concert for food at Park House restaurant in Cardiff.