The Stammstrecke is again getting a degraded service for the first two weekends in August, this time to replace sleepers between Ostbahnhof and Isartor. There will be only a shuttle service between Ostbahnhof and Pasing from Saturday night until early Monday morning.
Link to DB flyer in English and German
Well done to DB for putting an English translation from the off, since so many tourists will be around. They even managed to put "passengers" instead of the usual "guests".