Things to do in Warsaw?

Hello all! Me and my partner will be spending a long weekend in Warsaw next September for the Drift Masters final. As we'll be staying for four days we're looking at other bits to fill the days with! Already reserved a session at an indoor shooting range, but just to give you an idea of what kind of vibe we're looking for - Alternative bars/cafés and restaurants (anything gothic, rock or metal themed?) - Anything alternative really! - Motorsports - Anything geeky/gaming related - Any cool interactive workshops?

I'm so terrible at researching online, all I can ever find are walking/ food tours of the city! Thank you so much in advance!