When will Fireside end? I'm assuming Sunday night since Luminaire is all of December? I tried looking around but all I could find was the SubetaPedia which says it usually lasts around a week but it feels like it's been longer than a week already.

So yes, you're correct in assuming. :)

[edit]Forgot to ping you, like a dope. D;

30 November sounds about right to me. There's no mention in the seasonal announcement, nor is there anything I could find in the Comments underneath it.