Best way to sell passes?

I bought two 3-day passes for my husband and me, but something has come up, and we won't be able to make it to Ohio.

I know I'll have to wait until the tickets are mailed to me, but once I get them, I'd like to move them quickly. Should I post about them here? Can you sell physical tickets on sites like ticket master? Should I send them to our friends who are going, to have them sell them at the gate? Just wondering what my best option would be. Thanks!