It cannot be in one day, it is a tour, it is supposed to be a series of events on different days and in order not to saturate I think it will be in different weeks and in each event they will show or treat different aspects of the expansion, in interviews with different members of CDPR. Have they said they won't be at Gamescom? There are many important events where you can show Phantom liberty before it goes on sale and it is the best place to talk about its expansion. These events are a great showcase to exhibit your product and are seen and commented on worldwide, how strange that CDPR is not at these events.
Will the tour be in events created by CDPR? A titanic decision, I don't think so. They would only reach their fans and not the general public, which is what they want to conquer now.
Until they talk, we're a little confused about the marketing of the expansion.