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When Phish sold out all four of the April concerts it had booked at the Sphere, just as quickly as everyone expected, the obvious question arose: Why not do more? After all, U2 opened the $2.3 billion venue that remade the Las Vegas skyline this past fall with what was supposed to be a 25-show run — until demand built to a fever pitch, and the rock veterans shrewdly extended their stay, amortizing their investment in a dazzling, site-customized light-and-video show over an entire 40 nights.