What is this yellow box on the right side of the site? How does it work?
A recent meta question on MSO, Nailing it up on your Community Bulletin Board, presented the new feature. It's a moderator-only feature that allows us to share events, or meta posts in the Main site and the Meta site.
Pay attention to it from now on, as every important news will be shared there! :) The part on the side will let you know what type of event it is: in the example above, it's a meta question. If it's an event, you'll see event written on the side.