Comcast (NASDAQ:CMCSA) is offering complimentary access to thousands of Xfinity WiFi outdoor and indoor hotspots in the Northeast for the duration of the Summer Games from July 27 to Aug. 12.Xfinity WiFi has been launched throughout the greater Philadelphia area and its suburbs in addition to areas of New Jersey and Delaware. In addition, Comcast has roaming agreements with Cablevision and Time Warner Cable, under which Xfinity Internet customers can access hotspots in the Greater New York Tri-State area also for no additional fee.