Older Posts Now Shown in the Knowledge Panel
As Google Posts display for longer periods, there are fewer reasons to use Events.
Google Posts Show in Knowledge Panel for Over a Week
Google is now displaying Google Posts in the Knowledge Panel even if they were posted over 7 days ago. Google Posts now have a lot longer shelf-life, and you won't have to worry about the traditional post types disappearing after 7 days. Previously, people would sometimes use event posts as a way to get around this and have a post display longer.
With a longer shelf-life, there is no need for the workaround of using event posts within Google Posts.