National Clean-Up-Day (Switzerland)

Dates:
2019Sep 13Fri
2020Sep 11Fri
Frequency:
Every
SEP
Hashtags:
n/a
References:
mavillejardin.org/national-clean-up-day-2019/
x.com/Empa_CH/status/1304409706316926979
amkaeferberg.ch/…/?lang=en

This event is scheduled on various dates in September.