EntertainmentI’ll admit it:  I still get a teenage-style thrill out of seeing favorite music stars performing together for the first time — like Carole King with Jennifer Hudson and Mavis Staples. Is that cool or what? The threesome are among the highlights of this Friday’s (9/21) From Dust to Dreams: Opening Night at the Smith Center for the Performing Arts special on PBS, hosted by Neil Patrick Harris. They’re part of a lineup of luminaries that ranges from John Fogerty …