As we've said before, one major problem with fests is that they make ticket-buyers greedy. For the price of entry, music fans still have choices to make, particularly when it comes to Chicago's spectacular Grant Park for Lollapalooza: multiple stages run at the same time, including the prime hours during headliners' sets. This year's three-day fest -- which, doubtless, is or will be sold-out -- runs Aug. 6-8, and the complete schedule is out. In the following pages, we outline which blocks will cause the most conflicts of interest for concert-goers when it comes to how to spend their hours, whether with Lady Gaga, Arcade Fire, The Strokes and more.