Bank Holidays of the World
Lists Italian public holidays by region.
http://www.jours-feries.com/statique/index_pays2.html

Columbus Guides
Italian red letter days.
http://www.travel-guide.com/data/ita/ita070.asp

Italy Travel Escape
Online guide to public holidays in the country.
http://www.italytravelescape.com/Public%20Holidays%20in%20Italy.htm

Rome-Travel.com
A list of annual events and festivals held in Rome.
http://www.rome-travel.com/events.htm