There are literally hundreds of bars and restaurants in easy walking distance to the conference venue. Head south to Nollendorfstr (see https://tinyurl.com/6bedj58 ).
Alternatively take U1 east to Kreuzberg and Friedrichshain. Get lost in the famous "Simon-Dach" quarter ("Simon-Dach-Kiez" as we say in Berlin) with its cobble stone streets, wide sidewalks, bars, restaurants and cool little shops.
If the weather is as nice as it has been on the weekend, it might be worth walking or cycling a little farther to Holzmarktstraße. Between the streets "An der Schillingbrücke" and "Michaeliskirchstr." (see https://bit.ly/cNqLZq) there are a few really nice outdoor beach bars right on the banks of the River Spree.
Try Il Due Emigranti (Belziger Str. 38, Schöneberg) Best Italian food!
Excellent Burgers, Burritos, and Nachos in Room 77 (Graefestr. 77, Kreuzberg, U8 Station Schönleinstr.) Try the PlusPlus-Burger (no tomato, but bacon, spiegelei and penautbutter!).
Very good vietnamese food by 3 Moms (Hornstr. 1, Kreuzberg U6+U7 Station Mehringdamm), Try the Curries…
Californian-style Burritos at Dolores Burritos (Rosa-Luxemburg-Str. 7, Mitte, near Alexanderplatz), choose what's on your burrito…