XI Trobada de Boixets, Gandia (Valencia)
Sponsor:  L’Associació de Bolilleres de Gandia
Date: Sunday, September 22, 2013
Place: Casa de Cultura
Website:  http://tinyurl.com/nbff46e

I wasn’t able to find out much about this event, although it appears there is an associated event starting on September 14th.  The website of the city of Gandia is down.