settlers pass add on

Hi, I wondered if anyone could give me some advice. My family and I have bought ordinary tickets for green man festival but would like to now be in the settlers field and upgrade our tickets for settlers passes. Does anyone know how I can go about this please? Thank you in advance.

laura xx

Think they are availlable on the GM site now.  However, before they were listed I had this reply from the ever helpful man himself.
Thanks for getting in touch. You can upgrade your weekend tickets to a Settler’s pass here - . 
Thanks, GM