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/
Travel tips
The weather can be such an issue when you are visiting the north of Spain. Locals are used to it, and you know the saying "when in Rome..." So, in order to keep dry you just need a hoodie, rainy shoes, or a small umbrella. Carriying un umbrella can be a pain, instead you can buy one for a couple of euros in one of the cheap and conveniently located stores comonly known as "chinos". Similar to the pound shop in Uk you can find everything you need for a euro or less. Great for budget travellers!
