I don't know about the rock concert idea. It works for the case you have where it seems the character is fictional, but would people actually pay much to see a hologram of their favorite band? Part of the experience is knowing you are in the presence of the actual band, as well as the changes/improvisation that a band can do live. Of course, the latter could be solved by a middle ground case where the band tele-commutes to the performance. :) That might be enough for most people, to at least know the band is at least playing live. In fact, it might catch on to have massive simul-concerts, where many venues across nations are showing the same holographic concert simultaneously.

This idea came up in a book I read, more or less, but in terms of a rave. Dozens of parties were going on simultaneously, and they rigged the walls to display what was going on in the "next party over", so you could visually interact with the neighboring parties: you could wave at the wall and see someone waving back.