You are quite correct. I am getting mixed up .Thats in Pamplona Valencia is the Las Fallas in march http://www.visitvalencia.com/en/whats-on-offer-valencia/festivities/the-fallas
Great city, we went for New Year a couple of years ago- things off the top of my head worth doing:
- Get Paella at La Pepica it was fantastic- and also was Ernest Hemingway's favourite!
- Drink some Agua de Valencia- watch out though its lethal!
- Walk the river bed park
- City of Arts and Sciences
- Fallas Museum
- Ceramics museum