Originally Posted by Zandel

Actually having looked into this event from DMM, it was not a collection event like we have but rather an exchange event like our last one was. Not sure why Nutaku decided to change that but because they have i'm now not so sure there will be a secret garden for the event now. Last I checked Nutaku were not good at adding their own stuff to the games after all.

The revival versions will look like exchange events, but the original was still a collection with the same cap at 4000 items.

If you're looking at the JP wiki, it defaults to the revival event. The spoiler above the revival banner contains the original.