In Portuguese this is  the Feira do Pao e Queijo Fresco and takes place in the sleepy village of Vaqueiros. We visited in 2013 and only knew about the event by some roadside signs, perhaps it will be better advertised in future years but it seems to be the first sunday  in March.
 In 2015 it is on 8 March.

Despite a lack of fancy advertising the event was very well attended. Not surprisingly there is plenty of freshly baked bread and cheese of several varieties  on sale but also some craft stalls, pottery and plenty of places to eat and drink.

Is it ready yet?

What's nice about this fair and similar fairs in Portugal is that they remain traditional  in style and the locals all participate. No multinationals here, no Coca Cola, McDonalds or Starbucks.

Quite a few craft stalls at this fair

On this guy's back is a flagon made of an animal shin and containing some very strong alcohol.

As you can see it's a pretty popular event.