A place containing assets that were shown in some presentations would be a good thing.
I’m thinking about it after seeing this post: Inside Unreal: A Guided Tour of Gameplay Abilities - General / Events - Unreal Engine Forums, where the project files are located in this other post: A Guided Tour of Gameplay Abilities - Project Files - Announcements / Asset Sharing - Unreal Engine Forums
So I think that a place like the knowledge base (with categories), but containing all the presentations with (or without) project files and their respective files might be a good way. : )