We're too old to be planning parties, I leave it to the kids.
Hold onto your pants, you're about to get bombarded. More than you already are.
A voodoo witch doctor created a magical portal that got out of control, and started bringing people from alternate universes here. Not just from Beacon Hills, which is why there's vampires (unless there's vampires in BH and I just didn't know it. I wouldn't be surprised.). But ultimately, we both have about a dozen kids each, all different universes and histories, and a few duplicates of the same flavor.
It's really hard to complain about this place when there's a lot less death and the kids aren't being tortured daily by things at home, though.