Visit Michelangeli's David.
The Fazioli factory (and concert hall) is 35 km north-east of Venice, I have no idea if you can simply budge in, you should try to call them and ask if they do tours or something.
Be sure and get your hands on local event guides. Often, the small churches have excellent (and cheap) chamber music series. I've often just stumbled upon them while wandering the small byways in Venice and noticed the readerboards on the churches. The caliber of the "local" musicians in these venues is quite high. Depending on your budget, if you can't get last-minute tix to the opera venues, be aware they have more SRO opportunities than here in the states. Just follow the students as you run up to the 6th tier to stake out your spot. Caio
Michelangeli's David?