Continuing from
I have sent you an invitation to Allmende Pretix from where you can login to set up your event:
https://pretix.allmende.io/control/event/degrowth/summer-school-uk/quickstart/?congratulations=1
The user guide can be found at
https://docs.pretix.eu/en/latest/user/index.html
Please write any questions you meet along the way here. I will try to address them, and later on guide you through the payment settings.