For anyone who doesn't know what a blackboard concert is, let me explain.
The idea is that you show up and put your name on the blackboard. When your name is called you get to play a couple of tunes.
I'm using this concert as a motivator to get my solo playing up to scratch. I've been practising a Bach tune for quite a while - it's fairly tough. So, this week, I've been doing a lot of work on it to get it ready for performance. This involves slow practice and a lot of repetition.
I think I'll be ready.