There is a city...

Once a year on august 1st, the people of Warsaw pay hommage to the fallen heroes that fought for freedom in 1944 during the Warsaw Uprising. The biggest rebellion against German Nazi occupation during WWII cost over 200 000 lives and destruction of the capital.

More info:
http://en.wikipedia.org/wiki/Warsaw_Uprising
http://www.1944.pl/en/
http://www.warsawuprising.com/

Summer Cinema in the Park

different locations in warsaw (check the website)
21:15 (daily)// Free Admission

The summer cinema has been an integral part of the Warsaw landscape for several years. In a few places around the city (parks and open spaces) viewers can watch movies from July to late August (or early September).

from July 3rd to Sept 9 2012

(check the timetable)