Will reserve judgment on this event to see if it's another 'you have to keep EVERYTHING unlocked instead of actually playing the game' shafting with some of the event locations locked to upper level girls. At least everyone should be able to get the timeblock.

Also, I looked on the wikia and found no mention of this event. Which is not to be confused with the auto-linking that HBC does to its own totally unfinished wiki that appeared in the post above. No spoilers on the Steam community either.