The crack of the bat. The roar of the crowd. The smack of a well-caught fly. For more than a century, the sounds of baseball have heralded the return of summer. For the organizers behind Detroit's Opening Day Festival, there's no better reason to celebrate. Now in its fourth year, the beer-filled bacchanalia honors the American pastime's return to the Motor City with live bands, DJs, games, and food vendors. The festivities begin at 9 a.m. in the heart of Greektown. There, guests can fuel up in heated beer and food tents, test their fastballs at a pitching sensor, or batter each other during rounds of human joust. Musical acts including Killer Flamingos, Brena, and Detroit Kyro stalk the stage during live performances, and an able crew of DJs lays down a constant barrage of beats. Once the game starts, guests can catch every pitch on the enormous viewing screens scattered around the grounds. The fun doesn't end with the last out, though; the festival keeps the party going until 2 a.m.