Here are some festival in Spain that might interest you:
Rioja Grape Harvest Festival
Logroño
Sep 2008
This event also known as the Fiestas de La Vendima Riojana is a week long festival featuring wine tastings and great cuisine. Here you can also enjoy live entertainment, games, and a fireworks display.

Fiestas Patronales de La Virgen de Gracia
September. Albacete, Castilla y La Mancha.
With more than 400 years of tradition behind them, the Fiestas of Caudete are celebrated every year to honour its Virgin, La Virgen de Gracia. The main components are the fireworks, gunpowder, music, procession, and flower offering to the Virgin.

Fiestas de la Vendimia Riojana/ La Rioja Wine Festival
September (around the 21st, the Day of San Mateo). Logrono, La Rioja.
Harvesting festivities of one of the most renown wine regions in Spain. The Rioja is the center of a very important wine culture.

1 - 7 September 2008: Goyesca Fair, Ronda
Popular bullfight in which the fighters dress in the costumes shown in Goya's famous 18th century paintings. Before the bullfight there is a costume parade with horse-drawn carriages, through the town and ending at Ronda's historic bull ring, in the middle of the arena. Don't worry if bull-fighting isn't your thing: there's lots more going on too. Please note that hotels get booked up months ahead for this event.

Fiesta del Arroz & Concurso de Paella Valenciana, (5-14 September 2008)
If you like paella and other Spanish rice recipes, don't miss the Rice Festival of Sueca, where chefs from around the world compete in the international paella contest on the Paseo de la Estación. Held yearly in the first half of September, this events celebrates the excellent rice grown in the Albufera nature park with a giant paella.

21 - 28 September 2008: Fiestas de la Vendimia, Logroño
Celebrate the grape harvest in La Rioja.