If you're visiting Oviedo check out a couple of wesites to find out what is going on. There are a lot of expositions, concerts, shows and cultural stuff happening. Info only in Spanish though:
http://www.oviedo.es/index.php/es/agenda!showcategories?id=2
http://www.asturconciertos.com/
Concerts and events
recommendation by johnbrown- recommendation by johnbrown
Personajes (second hand book store)
recommendation by leverne
