An important Venetian holiday is held on the third week in July. It is the Feast of the Redentore, commemorating the end of the plague that killed fifty thousand people including Titian. The fireworks display is so extensive and significant that the re-election of the mayor is contingent on their quality (sort of like us picking a governor based on his movies). I have to add that they were the most incredible fireworks of our lives. I hope that mayor got re-elected.
For more info on things I've learned in Venice: http://havefunflysafe.wordpress.com/