clacko, you don't mention where you have miles in. Since SFO and MUC are both *A hubs, I imagine you'll be redeeming on UA or LH. Other airlines may require 1 or 2 more connections.
tbaumman, we never got reservations at oktoberfest, and just stood with most of the others in the big tents. The people sitting down (~10 - 20% of total) may have gotten reservations.
You should book hotels ASAP.