Nessie, don't want to make it too late, so what about 6:30 to 7'ish? Swiss Bobby suggested somewhere in Princes Square called Il Pavone. It's either that or somewhere Bath St/Sauchiehall street like Saninos or Ciao. SB may not be able to make it.
What's your preference? Are you coming down by train?
If we can get an idea of how many are coming I'll book a table nearer the time.