La Noche de las Velas (Night of Candles)

Practically year round you can find festivals all over Spain. There are (a lot of) religious festivals or those with origins in religion and saints, festivals to celebrate the harvest of certain products (garlic in Chinchón, saffron in Consuegra, etc.), and other wacky festivals that don't have much to do with anything (ever heard of the Tomatina? - if you like throwing tomatoes all over the place, it's the festival for you).

 One festival that I think is particularly unique and beautiful is the Noche de las Velas in Pedraza, which is a super tiny little town about an hour and a half from Madrid. The town itself is very well maintained, and deserves a visit on its own. However, it's even more charming if you go for this festival, which takes place the first two weekends of July every year. The town puts candles everywhere, in windows, on balconies, in the street, in gardens, you name it. Once it's dark they're all lit (you can even buy a candle to take around to light the ones placed around the town) and it's - for lack of a better word - magical.

They also have a classical music concert that you have to buy tickets to (though it's outdoors an you can hear it if you're close enough). If you go, you definitely need to reserve a hotel or make a restaurant reservation in advance because the town is tiny!