Need T-shirt Designs for a Holiday Party

We are having a family Christmas party and I would like to have some Tshirts made. I have attached a design that we had done a while back. The shirt will have NSN logo on the front and back as well as Xmas Party on the back with the year. I want to make the NSN logo look better as you can’t really see the S in the middle.

I would like a similar font but more easily readable and nicer. For the back I would like to make it more modern and maybe add something funny and somewhat Christmas related.