The official statement of the STPV:
At the end of April, the Federal Council informed that the ban on large-scale events for over 1000 people would be extended until the end of August. This means that numerous planned events are not possible. This also applies to the majority of pullings planned for 2020.
For further information, check here: http://www.tractorpulling.ch/de/
or, check here: https://www.facebook.com/Schweizer-Tractor-Pulling-Vereinigung-121620881190439/