Gothenburg's Slottsskogen is a proper city park, not a muddy field an hour from anywhere, and for three days every August it turns into Way Out West, one of the more sustainability-minded festivals on this list: no meat served on site, a genuinely walkable footprint. Nighttime programming spills into Stay Out West, club shows across the city center once the park gates close. Single-day standard tickets run 1,895 kronor.