Please find below some suggestions for Restaurants close to the Conference Venue:
The “Schwarzes Café” offers a rustic ambience and hearty cuisine.
Saigon Green offers authentic south vietnamese food.
Simela offers Buckwheat pizza, focaccia or even lactose- and gluten-free pizzas.
You can find a list with other options here: https://www.berlin.de/restaurants/stadtteile/charlottenburg/