The concert was moved from the outdoor venue "Rennbahn München-Riem" (a horse race course) into the indoor venue "Olympiahalle".
Olympiahalle is correct. The whole 2-Day-Festival was moved from the Rennbahn Riem to the Olympiahalle as not enough tickets have been sold.
the venue was the strange bld with a hanging roof. We camped on the grounds in the olimpic park.
I remember there were slopped sides to the arena like for roller derby and one could slid down to the better floor seats. I recall some confusion as to where the show was in reference to the camp area and last min changes were made.
after me sending an image of the Olympiahalle:
that looks like the place