Fans can list their Eventbrite tickets by connecting their Eventbrite account to Tixel here and following the steps in this article which you can pass on to your fans.
Here's what the process looks like for fans:
Select Sell your ticket
Select “It’s in my ticket account” and choose Eventbrite from the dropdown menu
Allow Tixel to access your Eventbrite account
Select the correct ticket/s and drag to adjust price
List the ticket. Fans can decide whether they'd like to make their listing public or private
Share unique Tixel link