If you're dying to catch the Chicago Opera Theatre production of Mozart's Don Giovanni, but you can't swing the pricey tickets — or you'd just prefer your opera with wine, cheese, and a picnic blanket — fret not. Tonight, a free, live simulcast of the Harris Theater performance screens across a giant screen (complete with English subtitles) in Millennium Park. Widely regarded as one of the finest operas ever composed, Don Giovanni traces the exploits of the mythical lothario Don Juan. The COT's production sets the action in a modern-day nightclub, but the magnificent Commendatore scene still retains its original soul-shaking intensity.