I just went online tonight and registered for the World Congress and it was a breeze to do.
Before you start have: 1. Passport out. 2. Credit Card Available. (350 Euros = $415 US approx.)
They allow partial payments which is great.
Here is link: https://registration.subud.org/event/world-subud-congress/details
Due to high volume at the site and it doesn’t come up please try again later.
Hope to see many of you in Freiburg.
p.s. Cheapest fares are I find are on Air France (with Delta) to Basel, Icelandic to Frankfurt, and Norwegian Airlines via Gatwick (add short hop from Gatwick to Basel).