Hack4Glarus is the first hackathon of Glarus. It is your chance to

Twice a year hackers from all around the world meet in Digital Glarus to hack on projects for 42 hours. In the middle of the mountains with the fastest Internet and a great atmosphere.

Checkout the Hack4Glarus website for the next one. Note: it happens bi-yearly (twice a year) and usually on the first weekend of June and first weekend of December.