Basically, take your favourite holiday event (eg. Christmas) and imagine they implemented an event and maybe some gear for it.
Now say we take Christmas, they might add a large public event or raid where you go through a seriously difficult dungeon to fight a Christmas style enemy ([i]Take inspiration from SAO's Nicholas The Renegade[/i]) or maybe just even a Spider Tank with a Santa hat or something... and then they might drop some guns or gear that relates to Christmas. Like a Candy Cane style rifle or green and pants, and a full matching set.
Maybe even vehicles?
[i][u]You get the jist![/u][/I]
Edit: I've noticed I didn't put a both option, just comment
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You fergot to put the and option man