Last year's show was also at the Orpheum, and I believe it was sold out. (Someone please correct me if I'm wrong.) Theatre capacity is 2780 people, so that's quite a turn out. Thankfully, only a small portion of the audience stayed afterwards for the meet'n'greet, or Mika may have been frightened away! I just hope it won't be as cold as last time, my feet nearly froze off.
Bitter.icarus, I do hope your mother comes around, and lets you go to the concert. If you want details about the last show, there is a concert review thread in this section. The date was Feb 15th 2008. I can't post the link at the moment, but I will later if you can't find it.