According to the website of the Camara Municipal de Obidos, it will take place between 10-07-2008 and 20-07-2008. (European Calendar Format).
Link here:
http://www.obidos.oestedigital.pt/events/PesquisaEventos.aspx?uid=8f3fdb91-e7ee-4a7c-8d30-340dd7c70bc8&cat=0&d=15-06-2008