This should be one to remember. This piece by Messiaen is one of the masterpieces of 20th Century classical music. Take a listen to see if it's your thing. A performance of this has been posted to Youtube, see link below.
This is part of "Masterclass Conducting" series in which younger conductors are given experience. Again, see link with description below.
30CHF for general admission.
20:00 to the left of the main doors in front. (I've never been there. So I'm not sure where best to meet.)