A "preview event" is a special gathering or exhibition where people get a sneak peek or early look at something before its official release or presentation. Full definition
From what we have seen at preview events it should be a load of fun and be an added bonus to the already worthy single player elements. (brutalgamer.com)
That said, they call these things preview events for a reason. (biggerpockets.com)
We got our hands on the big - screen and Switch versions of the game at a recent preview event, checking out the character creation feature, new multiplayer mode, and more. (co-optimus.com)