This week, the 100 Nights of Summer Tour takes me to Colours of Ostrava, a massive four-day festival held on the grounds of a former ironworks factory in the northeast corner of Czech. It’s one of the most eye-popping venues in the world for a music festival, with incredible sights around each corner, and more than 20 stages tucked into the various nooks and crannies of this re-purposed industrial site.