Devolverland Expo is a first-person 'marketing simulator' set within an abandoned convention center after the annual Devolver Digital game expo was mysteriously canceled. Break into the convention center and avoid the advanced security systems to watch and retrieve all the trailers, gameplay demo videos, and other secrets lost in the expo's cancellation.
Devolver Direct usually happens during E3, and is always great. This year they've also put out Devolverland Expo for free on Steam: