Some of Prague’s top festivals, including Designblok, Febiofest, Letní Letná and Prague Spring, have joined forces to organize a single, three-week event. The festival, called Praha Září, kicks off on Tuesday evening at Prague’s Výstaviště trade fair grounds. I spoke to one of the event’s organizer, David Gaydečka, of United Islands of Prague and I first asked him how the idea for the event came about: