It was Ovieto in Fiore (Orvieto in Bloom) while we were there. There are usually flower boxes and such, but there were far more than usual, due to the festival. There were other activities, as well - see below.
While we were walking through town, we came to the Duomo Square (Piazza Duomo), which was, surprisingly, barricaded off, and there were police entering the square. Soon exotic cars began to enter the square, coming up the narrow cobblestone streets. The cars were numbered and decorated as race cars. We had stumbled upon the Mille Miglia (1000 Miglia, or 1000 Miles).
The Mille Miglia was a road race conducted in Italy until the late 1950's. This was a resurrection of it, of sorts, with cars in different classes, touring from town to town, with parades and occasional time trials. Below are a few of the photos of the cars. More (OK, a lot more) can be found in a separate Spark page. You can enlarge the photos by clicking on them.