I think the O'Grady fight was at the Kelvin Hall mate. He fought Howard Davis at Ibrox on 7/6/80.
Going back to O'Grady, he's another example of the scum chasing after someone purely on his name. They were convinced given the name that be must be Irish American Catholic so paraded him at a game (v Kilmarnock I think) a week or two before the fight rigged out in their colours and they were chanting his name. Turns out that despite the name he was a Baptist! The fight was a few hours before the Rangers v Celtic match at Ibrox on 1/11/80 (and was my first game v them!) and the Bears were giving it laldy that Watt had won and their guy had lost. A bit of a tango'd moment for them