GW2 Halloween event carving pumpkins will give you achievement and title. You can carve them everywhere not just in Lion’s Arch. If you want to finish everything in the Lion’s Arch just relog to another overflow server.
In Queensdale there’s a guy that will grant you the title “Master Carver” if you carve enough pumpkins. There are 4 tiers of pumpkin carving before you get the title (150 Pumpkins). The title is account bound, so you can carve in the same area with different characters.
Wooded Kingdom Moons in Super Mario Odyssey