In the days when I actually went to large concerts, before online ticketing, I wondered the same thing: how could scalpers always get the good tickets when I was the first in line and the best tickets I could get were 40 rows back?
I'm all about any kind of alternative to mega concerts, and thieving bastids like Ticketmaster ;)
There are other forms of entertainment, like modern roller derby. In most towns and cities there are at least one all women roller derby league that takes it seriously as a sport, and many of those games have rock acts to boot (music type usually reflects the skater's taste in music). Usually a great value at $5-15 a ticket. A lot of non-sports types who are fans say "it's more rock and roll than rock and roll is these days."
One of our local leagues in LA(pics are mostly work safe, language drops some f-bombs):
Derby Dolls: The Best Event In L.A | La.Cityzine.com
Blood & Fishnets: L.A. Derby Doll Championship Bout @ The Doll Factory, 12/8/07
(both of those reviewers are entertainment reviewer converts to the sport, maybe with some passing familiarity of the game from when they saw it on TV as kids)
That league (the Derby Dolls) are a 21 and over crowd, and not a good substitute for Hanna Montana ;) Most leagues are probably more family friendly, are all ages and play on the more logistically simple flat-track:
List of roller derby leagues - Wikipedia, the free encyclopedia
(active leagues start 1/10 of the way down the page)
I agree about the tribute bands. Many are not only as good as the original band in their club days (unless they were totally artificial constructs like HM, Britney Spears, et al), but some are better. Held in smaller venues, it's always a better show if respectably executed because of your proximity to the stage.
Some have their own take on their band combining Abba and the Ramones, or the Beatles and Metallica, or Reggae and Led Zeppelin. Our best in LA is Atomic Punks, a Dave Roth era Van Halen tribute band that Dave Roth has poached guitarists from when he was solo. We also have a hilarious hair band tribute band called Metal Skool with some of the members from Atomic Punks.
Google has a page where you can do searches within the category of tribute bands:
Google Directory - Arts > Music > Bands and Artists > Tribute Acts
Of course, if your kids are the ones steering the entertainment dialogue (and why else would you want to see Hanna Montana?) I don't really think they're going to be willing to settle for some alternative. It's like the reaction girls have when you give them some knockoff of Barbie ;)