Going slightly off-topic here but higher chance of it getting read, since the latest Update all my chat channels disappeared and i had to manually rejoin them like /join level 70, /join 60-69 etc.
Just to be certain i deleted the char and copied it across from Live, same issue, no chat channels, might be a fringe case though.
Who is the target for this? In my opinion, you need to make this event manually triggerable. I have 2 children and a 9-5. I don't have time to sit around and play these RNG timing games to try and even make the content available.
Please add a manual trigger, or don't lock content behind stuff like this. It's not very much fun.