What I particularly like about the the 21st century dinner party is how people can't help being sucked in. True, at the start there's the normal "Ah there's a herd of elephants running through the Tube, I'll pretend I haven't seen them" Tube reaction. But the tone lightens as more people arrive and just start behaving as if it's a real dinner party - except one where beggars come up to you with notes about their troubled families, tourists decide to take a picture for the folks back home and strangers come in to grab after dinner chocolates.
Brings a whole new meaning to the "please consider others when eating food" posters though. Probably not exactly what TfL had in mind.