Okay, so after a zillion hits on the random number generator (it's getting hard to generate numbers that haven't already come up!), your challengee turned up as #52, which is Lisa.
I've had the pleasure of meeting Lisa several times and I can say you're in for a treat. We all know that Lisa has been in the middle of a major challenge posed by her husband and has been doing an amazing job with this long-term project. I'm betting she'll do just as well with something a little more modest in scope.
ETA: I realized there are many pages of Lisas in the YLF membership list, so let me clarify that you're challenging the Lisa who is a regular contributor to the forum and whose profile thumbnail is a butterfly. Let me know if you need any more specific information!