World's largest? Um, don't call Guinness. Old St. Patrick's Church hosts this beast of a block party to benefit social justice and outreach programs. The two-day event takes over a parking lot near St. Pat's in the West Loop, complete with food vendors, a bag tournament and plenty of tasty macrobrews. Stay through the evening to see cover bands like Mike and Joe, 7th Heaven and Dave Matthews tribute act Trippin Billies.