Liederhalle (main venue)
You could order your catering for the AGM during registration at 10 Euros per meal. Lunch and dinner will be served at the Liederhalle restaurant, and provided by Maritim Hotel. You may also buy drinks and snacks at various counters in Liederhalle (cash only).
Lunch and snacks from “Die Note” bar (Saturday and Sunday)
Just a footstep away from Hegel-Saal, and still on the grounds of Liederhalle, Die Note bar and restaurant also offer food and drinks. You can fill up inside the restaurant or on the outside terrace on Saturday and Sunday from 11am. It’s a regular restaurant, so you’ll have to pay whatever you have there. There is a mobile snack bar outside the restaurant too, which also opens at 11am, where you can get something on the fly.
Berliner Platz 1- 3, Schlossstraße entrance
There are three supermarkets within walking distance of Liederhalle.
Basic (organic supermarket)
Hauptbahnhof (central station)
On public holidays (i.e. this Sunday and Monday), there are several options to get food and drink on a low budget (bakery, kebab, foodstuffs etc.) from Stuttgart central station (Hauptbahnhof), which is two stops away from Liederhalle.