You can share a direct link to any individual post from an event to social media or any other destination.
Click the Share icon in the upper right corner of the post.
You can either copy the given URL and paste it to your destination of choice, or click your preferred social media provider's icon at the bottom of the window.
If you choose the latter, a window from that provider (Facebook, Twitter, Tumblr) will open with a post editor and allow you to share the link. Keep in mind you will be prompted to log in to that provider if you aren't already.