Do I cut my losses, or do I add to them?

So, I'm getting ready to do my Christmas shopping, and money is a little tight. I have two tickets to a concert tonight, that I spent $120 on. I "lose" $60 guaranteed, as I have an extra ticket not being used.

I'm not sure if I should go to this show, as Uber, alcohol and food will run me (at least) another $120 and I need to budget for Christmas.

Do you think I should just go and enjoy my night, or hold off and keep that extra $ for Christmas?