Definitely go. It's true that he may be unavailable, so you need to go without getting your hopes up too much. But at least then you'll know, instead of always asking yourself "what if I'd gone?". And besides, even if he's unavailable or if he turns out not to be as great on 2nd glance as he was at first, you'll probably meet some other great people with similar interests and you'll get some training in to boot.

Go! And then come back & post & let us know how it went!