Nic,
I think the festival you are talking about it the
www.paleo.ch in Nyon. I have not been to any but there are quite a few other open airs all over Switzerland.
For checking gigs your best option is looking at
www.starticket.ch and
www.ticketcorner.ch Both are available in English and there are alot more gigs here besides mine (Jet, The Rifles, Shakira, Nelly Furtado, Corinne Bailey Rae, Bob Dylan, Snoop Dogg, Nine Inch Nails, Deftones and lots more).
I have just bought my Fratellis so if anyone fancies a few beers beforehand (Outback pub maybe?) let me know.