As Munich has a number of different hacker clubs, The Arduino meetup takes place at different locations.
FabLab is located at Gollierstrasse 70, Westend.
Munich Maker Lab
Munich Maker Lab is located at Werk1, Kunspark Ost/Haidhausen.
The MCSM Maker Lab offers a great variety of tools, wifi and a number of electronic equipment. Especially, due to the Siemens background of the space, there are many electronic spare parts that are free to use to Club members.
MCSM is located at Rupert-Mayer-Strasse 44, Obersendling.