From 06.12.2016 0:00 to 06.12.2016 23:59 you can find on item shop:
On sale:
Christmas Costume (red) 15d/nB - VNUM: 41137 - Price: 49 DCs
Christmas Hat (red) 15d/nB - VNUM: 45075 - Price: 29 DCs
Christmas Costume (red) 15d/Bonus - VNUM: 41145 - Price: 69 DCs
Christmas Hat (red) 15d/Bonus - VNUM: 45081 - Price: 49 DCs
Christmas Dress (red) 15d/nB - VNUM: 41138 - Price: 49 DCs
Elf Hat 15d/nB - VNUM: 45078 - Price: 29 DCs
Christmas Dress (red) 15d/Bonus - VNUM: 41146 - Price: 69 DCs
Elf Hat 15 d/Bonus - VNUM: 45084 - Price: 49 DCs