There's twelfth perigree's eve, which I believe is the closest to human Christmas, but that depends on the troll and lusus. Before I died, my lusus and I used to decorate, and she'd go and collect a behemoth leaving...

Then there's wriggling days, of course, but it's not really celebrated like humans do! I think I prefer the human way, really. So basically I suppose it's a cultural thing! [ Trolls generally don't get together for much. It probably wouldn't end well, anyway. ]

Hmm. Eleven people from home, barring anyone else showing up, and four people from here!