I know this post won't be seen by a lot of people soon but I'm posting this anyway:
Double Exposure is an organization that promotes the gaming industry by partnering with game companies to showcase their games at cons like Gen Con. They also run the playtest hall.
They have a new website where you can join our heralds as we teach games every day. You will probably need a third party software like Tabletop Simulator or Tabletopia but the website and game sessions are free:
We're very excited as this venture goes forward as we will be working with virtual gaming conventions and gaming companies to teach their games to the public.