The Steam Game Festival is returning for another round, starting on June 9 developers will be able to show off their games on Steam. If you remember, Valve did one only recently with a bunch of games having demos and it appears they're going to do it bigger this time around.
From the press release:
The Steam Game Festival is an event that shines a spotlight on games set to be released within the next year. From June 9th - 14th, game developers have the opportunity to show off their upcoming releases to a global gaming audience, giving gamers on Steam the chance to try them out, learn more, and add games to their wishlist!
Additionally, they're trying to pull in more developers this time around inviting any to get involved. Developers need to have a Steamworks account in "good standing", a release planned before the Summer of 2021 and a demo. For any developer wishing to get involved, the deadline for submissions is April 24 and you need a demo ready by May 15. See more here if you're a game developer on Steam.
For us normal users of Steam, Valve has setup a dedicated page allowing you to set a reminder.