Went to the show with Adrian last night, and we both enjoyed it very much. There were generally only 2-3 people between us and the stage, so it was close enough that he could get decent viewing angles despite being a foot and a half shorter than everyone else. Lots of people, incl. staff thought it was really cool for him to attend (and Christina even had him wearing his tie-dye t-shirt when he got dressed in the morning).
Tom Johnston's teen-age looking daughter Lara was the opening act, and she's got a voice like Susan Tedeschi.