I had, I think, a rather unique experience this year: I ended up fulfilling the challenge in a fandom my recipient had requested in their letter, but which hadn't actually appeared among their sign-ups. In my defense, my assignment as it appeared on the AO3 was the standard list of fandoms, but the "details" section all pointed to the same letter, so I worked off that as I wrote and totally failed to notice the discrepancy until I began hunting through the all-letters spreadsheet looking for opportunities to write treats. Everything turned out all right though, so, other than that burst of last-minute panicking, Yuletide went really well! And I'm glad to have been able to jump back in for the first time in forever.