One of the great frustrations of being a fan of a wildly popular band or musician is the necessity of seeing them live only in grossly oversized venues with terrible acoustics and no sightlines. So it’s getting attention that a number of high-profile performers are mounting shows this summer in decidedly scaled-down venues. On the plus side, those in attendance will get a much more personal performance. On the down side, not many tickets are available, and the ones that are will surely cost you…