Here is a list of accommodation suggestions:
Courtyard München Garching (closest to the venue)
Hotel König Ludwig II. (in Garching town, 1 stop away from IAS on subway U6)
limehome (in Garching town)
Park Residence (in Garching town)
ibis Munich Garching (Garching-Hochbrück, 2 stops away from IAS on subway U6)
Motel One München-Garching (Garching-Hochbrück)
B&B Hotel München-Garching (Garching-Hochbrück)
Garching and Garching-Hochbrück have other options, for accessibility to IAS check that the next U6 stop is close by. U6 connects Garching and the University Campus with downtown Munich (about 1/2h ride), where plenty but more expensive accommodation can be found:
Hotel Hauser (near U6 stop Universität)
B&B Hotel München-Schwabing (near U6 stop Nordfriedhof)