It's okay if you don't make it. I understand all too well how being a musician sometimes makes it hard to get to concerts - your own work can get in the way. I've been coming up against that myself recently.
The cello sonata is coming along, although slower than I would like. It's based on two Polish folk songs about fish. I'm working on the opening movement, which is going to be slow and abstract, but uses a refrain-verse-refrain type form.