Each year, the EPFL college near Lausanne holds a japanese convention called "Japan Impact". This year it landed on the14th and 15th of feburary, and since my brother was working there I decided to go by and have a quick look. The entrance fee was 12 francs for students and 15 francs for adults. Once inside I got to have a llok around and enjoy some of the activities offered.
Then I walked around for a bit and enjoyed all the costumes people were wearing and looked at everything that you can buy. The convention sells tons of stuff ranging from japanese snacks to video games and stuffed animals.
After that I went and looked at some origami and caligraphy classes but didn't participate in any.
The convention was considerably smaller than the other swiss japanese convention "Polymanga" held in Montreux, but it is entirely student run and norprivetely owned.
If you live in switzerland or are passing by in feburary next year I highly encourage you to come and take a look!