Honestly, let's bring geocities back (not exactly in that form). Anything that isn't a throwaway post on social media goes there, and you can post links to it from all the social platforms for reaching a broader audience. Then there's a place for getting the most up to date information about an event, that doesn't require making an account, and the person putting the event on doesn't have to make sure posts across multiple platforms are updated with the same new information.