Hear me out,
Village, a map for Winterfest, become a permanent map.
Village would seem like a cool permanent map and Spooktober map, so much creativity is in it!
A village would be great as a permanent map because villages are in Minecraft. They could make variants for different seasonal events.
All they have to do is remove the snow.
(Possibly come true?)
TLDR: Village would be cool as a permanent map