The Fantastic Beasts and Where to Find Them fan event will be made up of two parts.
However, those in attendance in London and Los Angeles are the ones who will get the extra special treat.
Actors Eddie Redmayne, Katherine Waterston, Alison Sudol and Dan Fogler will be in attendance in London alongside director David Yates and producer David Heyman.
The event is also being simulcast to 19 different locations around the world.