Fiesta events are currently on in Puerto del Rosario. It finishes on Monday 7 October, which is a local holiday in the capital.
The funfair is on every evening as part of the Fiesta, at the Recinto Ferial.
Full details of events here: http://www.puertodelrosario.org/35017fic/ficheros/documentos/docu_4109_1845.pdf (http://www.puertodelrosario.org/35017fic/ficheros/documentos/docu_4109_1845.pdf)