score:2
If you're looking for concerts, festivals and things like that, this list can be useful:
http://eventful.com/rome/events
Another event list that is very useful is In Rome Now. It is a little bit at short hand notice, but it always lists the events for the coming week.
Upvote:1
As said in the comments, you can find a lot of results using Google, but if you are looking for something more customized, have a look to Guiomatic. That's an automatic guide generator based on the city you want to visit and the dates you will be there.