Okay, I'd really love to be a part of this, but I'm not going to be able to commit to be at every session, especially since that's getting close to finals week. Given that there are only a couple people signed up thus far, would you be alright with me coming if it doesn't fill up by the first session?
I wouldn't want to take the slot of someone who can be there for every session, but if it's alright with you, I'd still like to join.