https://www.dhv.de/web/piloteninfos/drachenflug-welt/

The DHV plans for the 14/15 April 2018 (alternative 21/22 April) a
season opening with a hang gliding and wind exhibition, lectures, trial courses,
free flying for paragliding and hang gliders, etc. in Hartenstein at the
airfield. A replacement for the weather-related unusual Hang Gliding Meeting
2017.