Galicia, and Spain, are well know for their fiestas (or festas as they say in Galicia). The big season is summer, when there are one of these fiestas every weekend. They usually have a theme, and I saw in the paper today that the 33rd Cheese fiesta will be held this upcoming weekend, kicking off the 2008 fiesta-season.
This is all happening in Arzúa, they are celebrating the 33rd annual cheese this upcoming weekend starting march 2nd 2008. For the full program, have a look at the official program at the Arzúa county website.