I'm really sorry about that. It was actually cancelled yesterday, but not communicated very well; the notice was posted on Facebook, and I didn't realize until this morning that nothing had been posted here. We'll have an internal discussion about being more thorough with this sort of communication.
Thank you very much for coming out; I know it is super frustrating to set aside time to help out and have it not work out. Your effort is appreciated and I'll try to make sure this sort of thing doesn't happen again.