Well, I didn't actually get to go to a live match. My two friends went to the England vs. Tunisia match in Marseille when the riot broke out. They were nearly killed.
But even though I didn't get to go to any matches (horribly expensive), there were several very large screens set up all over Paris. Big screens, like an IMAX size in strategic places like the courtyard in Notre Dame, and near the Tower. Thousands of people would gather around these things during the day, businessmen, police, kids...anyone you would see on a given day on that street.
Imagine having thousands of Bills fans watching our team win the Super Bowl on a huge outdoor IMAX screen... in Buffalo. It was very much like that.
One of my best memories from that trip was sitting on the "lawn" of this one area in front of the screen at the Eiffel Tower made up to look like a football field smoking a fat euro cone. Ahh, the carefree days of youth...