Old School RuneScape players have access to a stash of rare items doing the old school Christmas event 2013, which is the 2006 Christmas event.
Travel to musa point. An amulet of glory can transport you there fast, but most players will teleport to Lumbridge, run west through draynor and down to port sarim. Be sure to bring 30 coins, as you do not have a money pouch in old school RuneScape. Go to the docks and sail to Musa Point.
Go to where the fishing spot is, and go to the docks just west of there. Talk to Shanty Claus to start the event.
Go west to the volcano and to the southwest part of it. Gather roughly 100 snowballs by clicking on the heap of snow and you will automatically gather them. Then descend into the cave and pelt the NPC's there until they freeze. Pick up ten sets of shards and return to shanty Claus.
Put a set of fragments in each cage. When all the cages are full, talk to shanty Claus. You will get the reindeer hat, the wintumber tree, and a slew of hats and scarves. You will also receive a black party hat and a rainbow party hat; all these items are non-tradable and if destroyed will be reclaimable from diango.
You will also receive noted two Christmas Crackers, and two party hats of each color. Although there is no guarantee they will be as rare as in regular RuneScape, one should definitely acquire these items as they are definitely not common or always obtainable.