Austria's biggest festival crowd, something like 140,000 people a year, gathers on a riverside campground outside St. Poelten for three days every August, an all-night campsite reputation that arrives before the actual lineup does at this point. This year's three-day pass runs 279.99 euros with camping and parking included, day tickets 139.99. It is 12 and up only, and the campground genuinely does not sleep, so pack earplugs along with the tent.