this truly is the hardest question. :( but after much consideration, I think Endless Halloween Night wins out for me, because it's nonstop Characters Being Silly the whole way through. the whole thing is just lots of these little dorks having the most ridiculous interactions, which is always my favorite! and of course the big twist is SO delightfully stupid and doubles down SO hard that it becomes AMAZING and I 100% unironically adore it. AND it's Halloween! everyone is in their cute little costumes and having a spooky adventure! it's great!
however, I am ALSO a big fan of the Harveston event! how can I not be! everyone is wearing comfy winter outfits and getting along really weirdly well with Epel's grandma and he's getting a little worried about that! my terrible loud son sews a plush squirrel and then gives it a silly little nickname and refuses to leave it behind when it breaks! the ending shot with the sled! I LOVE IT.
Dammit, Lilia! Malleus gets a pass because by dragon standards he's still a babe and is genuinely ignorant of how things work. YOU should have known better. My poor Silver bby!
(Thankfully Lilia realized this and apologized to him.)