I'd go just to see if she puts on a good concert. Sometimes music and an average performer can be enhanced by seeing the live spectacle.
Have a nice dinner with your brother before hand and look at it as an excuse to hang out for the night doing something you wouldn't have otherwise done, even if that thing is going to a Miley Cyrus concert. Who knows, you might have a good time despite your attitude about her, and if you don't, you have a memory to look back on with your brother and laugh about that time your mom gave you those concert tickets.
Have a nice dinner with your brother before hand and look at it as an excuse to hang out for the night doing something you wouldn't have otherwise done, even if that thing is going to a Miley Cyrus concert. Who knows, you might have a good time despite your attitude about her, and if you don't, you have a memory to look back on with your brother and laugh about that time your mom gave you those concert tickets.
Teenaged X-Files obsession + Bermuda Triangle episode + Self-led school research project = Atheist.