L'Ariosto is nice.

A couple of other alternatives:

Fratelli Sarti - www.sarti.co.uk 0141 204 0440
Sannino pizzeria - Bath street. www.sanninopizzeria.co.uk.
Pizza Hut?

All within a short walking distance of the Merchant City. There loads of nice bars and restaurants in that area if you don't fancy italian.

You could always jump in a taxi and head for the west end.
Ashton Lane is the place to be on a friday night!

Also, that weekend is a local holiday in Glasgow - the town should be lively that evening.

Is this a golfing trip and,if so, where are you playing?