In the summer months, Berlin offers an unbelievably diverse cultural program, and it's completely free. A selection of the events can be found here:

Summer festival House of Statistics: Allesandersplatz at Alexanderplatz
July 21, 3:00 p.m. — 10:00 p.m
House of Statistics

Folk theater for everyone! Open Day at Globe Berlin
July 22, 2:00 p.m. — 12:00 a.m
Globe Berlin

Summer in the City - Time to Dance
July 26, 2:00 p.m. — 10:00 p.m
Breitscheidplatz at the Kaiser Wilhelm Memorial Church

10 years of "Long Night of the Berlin Film Festivals" - film, music, party
July 28, 3:00 p.m. — July 29, 1:00 a.m
Kulturfabrik Moabit & Filmrauschpalast

Sommersause at Holzmarkt25: Live music by Sophie Hunger, Bonaparte and Lover Buffet and DJ sets by Pilocka Krach, Aka la Flaca and Stella Stellar
July 29, 1:00 p.m. — 10:00 p.m
Holzmarkt25

ALCHEMY Part I & II: Subversive Tenderness - music, performance and poetry on the Teufelsberg
July 31, 6:00 p.m. — 10:00 p.m
Teufelsberg radar station

The court theater of the Ernst Busch Academy of Dramatic Arts celebrates its premiere
August 2, 7:00 p.m. — 10:00 p.m
Ernst Busch Academy of Dramatic Arts

Namaste Berlin - A festival with music, art and cuisine from India
August 5, 12:00 p.m. — 10:00 p.m
Villa Elisabeth, Invalidenstrasse 3

Open air concert in the Friedrichshagen open-air cinema – Lie Ning, Romano & Aka Kelzz
August 8, 5:30 p.m. — 10:00 p.m
Friedrichshagen open-air cinema