I think it makes sense to keep it private. While it is of course true that someone who becomes privy to that secret could post it here, e.g., it would not be widely known. If someone was doing a play in my (small) building, I would prefer not to see the address advertised. I think holding it down to 24 hours would be silly but it doesn't actually say that. It says "at least" which to me communicates that you will know far enough in advance to plan your evening. Anyway, I this this is super cool so Imma gonna defend it.