The victim, 27, was attacked while attending the Courteeners gig on Friday 5 June leaving him with a fractured cheekbone in two places.
The man was later admitted to hospital and needed an operation to have two plates inserted into his face to stabilise his cheekbone.
A 27-year-old man has been arrested on suspicion of grievous bodily harm and has been bailed until a date in July.
Anyone with information is asked to call police on 101 or the independent charity Crimestoppers, anonymously, on 0800 555 111.