𝐃𝐞𝗺𝗼𝐧 𝐒𝐥𝐚𝐲𝐞𝐫 𝐏𝐫𝐞𝐟𝐞𝐫𝐞𝐧𝐜𝐞𝐬

Them as holidays

NATIONAL LAMPOON'S CHRISTMAS VACATION
"I don't know what to say, but it's Christmas, and we're all in misery."

Tanjiro - Christmas obvi I mean what else would he be

Zenitsu - the scared part of Halloween

Giyuu - the non happy part of Valentine's Day I was stuck for a bit trying to think

Rengoku - New Years or Christmas but most likely New Years

Shinobu - April Fools bahahaha it's perfect for her

Tengen - Fourth of July cause of the fire works