Read the following article and answer the question.

I had planned to spend Yule with my mum and family down south , but obviously I ca nt leave him like this when he needs so much looking after and I would just be worried about him , so I ' m in York for mid - winter . I was worried that I would be on my own ( Aaron and Barney will be with Aaron 's mum in Luton , Ellen and Luke will spend Christmas day with Ellen 's family ) with only a crippled cat for company . Luckily there were penguins to the rescue ! Baz and Gemma very nobly agreed to join me in York , and very grateful I am for it .

What holiday is the narrator getting ready for ?
They are celebrating XMas .