Germany also “celebrated” the International Ragweed Day. Here are 3 examples of action carried out on this occasion (texts in German):

https://www.pnn.de/potsdam/allergiegefahr-ambrosia-ausreisstag-im-bornstedter-feld/24465990.html

http://anjagrabs.blogspot.com/2019/06/ambrosiabekampfung-grune-fordern-klare.html

https://www.rbb24.de/panorama/beitrag/2019/06/ambrosia-allergieausloeser-unkraut-ragweed-day.html