Cartoon Network's sibling channel Boomerang will run a Laff-A-Lympics marathon on Friday, July 27 starting at 10 AM ET / 7 AM PT running to 2 PM ET / 11 AM PT and then from 6 PM ET / 3 PM PT to 10 PM ET / 7 PM PT. This is in conjunction with the Summer Olympics in London.
The gap between 2 PM ET to 6 PM ET will be filled with eight episodes of Hanna-Barbera's 1979 show The Super Globetrotters (probably for the U.S. Olympic basketball team).
And if I'm not mistaken the marathon continues from at least 7/28 thru 7/29 as well. Looked it up last night but can't recall the details. Did appear all episodes will be shown though. Some twice. Prepare your DVR's!