Looking for free family fun this weekend? Oxford is kicking off summer this Saturday, June 6, with a massive block party downtown at Simmons Park starting at 11 a.m., featuring free hot dogs for the first 200 guests, free amusement rides and a sprinkler hose provided by the fire department! The fun keeps going at 8 p.m. with a free outdoor screening of "Shrek" on the OPAC lawn. Bring your blankets, lawn chairs and even your leashed pets for a ni…