This should be a great performance. We can meet before and at intermission.
From the concert description on the Tonhalle website:
19:30 Uhr, Grosser Saal
Bernard Haitink Leitung
Sinfonie Nr. 9 D-Dur
CHF 150 / 125 / 100 / 75 / 40 / 25
More expensive than some but with a Mahler concert you get your money's worth from its length alone if nothing else. :)
The Tonhalle website link:
Click on the calender date 17.
A performance conducted by Bernstein to give you a taste.