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May 31- June 01 2022
Alte Kaserne Winterthur
September 7th and 8th 2021
May 14th and 15th 2019
Umweltarena Zurich
1st, 8th, 15th, 22nd and 29th of September 2020
Online
May 2nd and 3rd 2018
3 - 4 May 2017