Any recommendations for concerts or festivals before September 22nd?

I'm traveling between Portugal and Spain from September 12th to 23rd, and my initial idea was to go to Germany to see a Colour Haze show, but they won't be playing during that period.
Does anyone know of a good stoner rock concert or festival, or similar styles, that I could go to before the 22nd? Preferably in Portugal or Madrid, but I'm willing to change my route.
Thank you!