There is a juggling club in Munich which meets every Monday evening. During the summer month this happens in the English Garden. Take the U-Bahn to Universität and then walk directly to the English Garden. The juggling group hangs out on the grass half-way towards the Monopteros.
During the winter months they meet in the gym of the school on Grafingerstrasse. Take the U-Bahn to Innsbrücker Ring.