A Gathering of Redheads
This gathering could easily be mistaken for a meet-and-greet event for various reasons, but the first thing that comes to mind is that we've stumbled upon the annual Weasley family meeting!
After all, the Weasleys are one of the most renowned red-haired families in the world, even though they are fictional characters from the magical world. Until we receive more context for this otherwise amusing gathering, it's rather enjoyable to entertain the idea that this slice of the magical realm might just be real.