Why Do I Always Work on National Holiday When I Work Abroad?

The first of August is the Swiss National Day but it doesn't mean people at CERN don't work. At least Summer Students including me. I don't know what I do wrong. When I worked at Union last year, it was the same with the Fourth of July (US Independence Day). We worked and just had a barbecue after work.

The picture of the day is a bird in the data center. I'm just wondering if it really lives there or just got lost :)

A bird in the data center