IOP02 is mere hours behind us, but we again set our sights on the coming night. With the chance that it will be even colder and clearer than yesterday, while being just as calm, it is an opportunity that we can not pass up. Yesterday’s IOP was a rigorous one, with low-level vertical profiles of the boundary layer performed almost hourly, and SUMO flights up to 1800 m every 3 hours. We were able to track the evolution of the stable boundary layer over 18 hours, with each institution working in shifts. If last night was our first real opening night, we’re about to start the main event.