Event & organizer pages:
https://www.instagram.com/ulassai.festival/
https://www.facebook.com/festivalulassai
http://ulassaifestival.com/

Check out the video:
Ulassai Festival 2019

Description of Ulassai Festival on SlackGuide:
English language version
Polish language version

Event page:
https://www.facebook.com/events/2061077314249373

Organizer pages:
https://www.facebook.com/swissslackline/
http://www.swiss-slackline.ch/

Check out the festival video:
Transalp Waterline Tour 2021

Event & organizer pages:
https://www.facebook.com/drillandchillfestival/
http://www.drillandchillfestival.com/

About Drill and Chill on SlackGuide:
(Polski) https://slackguide.info/drill-and-chill-climbing-and-highlining-festival-2/
(English) https://slackguide.info/en/drill-and-chill-climbing-and-highlining-festival/

2021 Drill & Chill Climbing and Highlining festival VIDEO:
https://www.youtube.com/watch?v=eMWFQHDdWW8