Funfairs, street markets and exhibitions are always (as the word itself states)
fun - we can agree that maybe not so much for the neighbours.
The festival itself is in honour of the local patron saint.
The focus of today's mass in his honour is still the benediction of "St. Narcis Cotton", which is given in small portions to the faithful audience. Even people who would not call themselves religious would use this throughout the year whenever they have ear pain (nothing serious, just because of a cold or so...).
Even if used as a folk remedy, there's a more spiritual dimension to it. Various (spiritual) schools of thought coincide on the idea that words we think and speak affect our lives and the other's. So these cotton balls should either shield or cure you.
Regardless of your "faith status", please keep this in mind when giving feedback and comments, for words can either give wings or or tear down somebody