This is true - once you are there you will be glad you went.
I had one of those 'can I really be bothered?' moments last year when I had to rush from work to home to train to gig, just to go on my own and it was going to cost me loads in taxis etc - I was very close to not bothering at all and staying at home in the warm but I was so glad I went - it made a cold crap week into a happy christmas event which cheered me up no end.
So don't wimp out, you will be all the better for going.