My God! A 'real' person!! Sorry to read of your dilemma though and I'm afraid that I can't be of help but it may be worth your checking with the box office regularly, in case of returns. They have a very good returns policy so, the chances are that, if someone can't make it, they will return them rather than hold onto them.
Good Luck and, if all else fails, you could wrap up warm, bring a flask of mulled wine or something and a little birthday cake and sit outside under a blanket of stars.... or just huddle under a blanket, if it's really cold!
If you are reading this, you are reading some pretty archaic posts(!) Please would you read the following article and add your name:
http://iransolidarity.blogspot.com/p/stop-tsunami-of-executions-add-your.html
Many thanks, Rae 27.2.11