Brian,
The irish bars are in name only - I have never seen draught guinness, but you will get it in cans although it is expensive. If you ask any of the bars to put the game on I am sure they would. You can also get canned guinness in Venice, if they have not got it in they will get it for you - just ask Apo.
Let's hope the Gers and Celtic do well this week.
Archieb