You can contact the Lustrum Committee to sell individual events of your package. 

For example, if you have a Passe Partouts but you can not attend the Lustrum Cantus, you can contact the Lustrum Committee to see if they can help out with selling your tickets.

Packages are sold by name, and resold tickets are solely managed by the Lustrum Committee.

It is not allowed nor is it possible to sell your tickets yourself without notifying the Lustrum Committee since they manage the administration and names on the tickets. 

It is your own responsibility to contact the Lustrum Committee. if you sell your ticket without notifying the Committee, the person you sold the ticket too might be denied entrance to the event.