I try my best to keep the events as updated and accurate as I can, but I can't do most of it without others helping me find information or giving me leads of where to start looking. And yes I have communicated with DannyB01 for years, but there is information that isn't common knowledge about this Altering Cave event. For example he doubts the Altering Cave Wonder Cards were ever distributed. But he has also informed me that the Altering Cave event could be activated by some WonderSpot events, which is how the Mexican Wonder Card is activating it.
Also I would like to inform you that even he had doubts about the Mexican Wonder Cards, but he can confirm that everything checks out with them and they are legit (I keep forgetting to send a email to the person he got them from).
As for your last little part, he is very secretive with his information since if it were to fall into the wrong hands it would cause people to make hacks very easily. And therefore destroy the value of some of the rarest events out there. And hence one of the reasons why there is even some details (not about Generation III Wonder Cards, but something else from Generation III) that I simply can't reveal to the public until the time is right or even possibly never.
Yes we are missing a ton of distribution dates for these Ticket events on the site, but we do have the Comic-Con distribution listed on Bulbapedia.