It featured a lineup of British blues bands , including Fleetwood Mac ( the headliners ) , John Mayall 's Bluesbreakers , Ten Years After , Led Zeppelin , The Nice , Chicken Shack , Jon Hiseman 's Colosseum , Mick Abrahams ' Blodwyn Pig and Principal Edwards Magic Theatre amongst others .

Events include Cause_to_be_included Mud Pit Belly Flop , Bobbin ' for Pig 's Feet , Redneck Horseshoes , Hubcap Hurl and the Armpit Serenade .