Can I sell my tickets for Fenway (9-4-18) back to the Fan Club?

I am taking my son 9-2-18... I was hoping I could transfer the pair for the 4th and he could take a teammate from Umass to the show. I only found out recently that i had to be there both nights to get my tickets.  I have to be back home and to work. It kills me to not go to both nights...but I cant stay away that long. I would love to sell the pair for close to face value. 
How difficult is it to sell a pair?
Sincere gratitude for any help.