Oasis brings its long-awaited reunion to Allegiant Stadium, with Richard Ashcroft joining the Manchester brothers for a night built around anthems like "Wonderwall" and "Don't Look Back in Anger," the kind of stadium singalong that doesn't come around often. Over at the Palazzo Theatre, Mark Shunock marks thirteen years of Mondays Dark, gathering performers from across the Strip for an unpredictable variety show that mixes charity with genuine Vegas spontaneity. Meanwhile, Styx settles into The Venetian Theater for a run of shows built for longtime fans, working through "Come Sail Away," "Renegade," and "Mr. Roboto" with the vocal harmonies and guitar work that made them arena staples decades ago. Each offers a different flavor of nostalgia, from stadium-sized rock reunion to intimate local tradition to classic FM radio staples played live.