How to sell one day of a two day pass?

Hello! I have festival tickets and only want to go the first day. I could only get the two-day pass, but would like to sell the second day. Can anyone recommend a way to do this on stub hub or elsewhere? I was thinking craigs list.

I can't give the pass until I use it the first day is the main challenge, but I can transfer it the morning of the second day.

any help is appreciated!