Here's an idea for Swiss National Day.
Welcome to Fridji Island!
Motherland invites you to celebrate Switzerland's national day on Fritschiewiese with cosmopolitan djs like El Gayo Negro from Mexico. Fridji Island also has a radio station which plays tunes from the visitors' ipods and mobile phones. Music, food, entertainment - sounds like a good place to be on a free Monday. So happy bank holiday!
Monday 2-6 pm, Fritschiwiese
Source: Ron Orp's Mail Zurich