1975 - Lucas forms ILM
1976 - Shooting begins on Star Wars
1983? 84? - Lucas announces no more star wars movies. It occured around the time fans usually expected to hear about the next star wars movie. I remember seeing a press conference on the news (and on kiddies 'Newsround') with a visibly weary Lucas, sounding like he was just burnt out by it all. I've never seen this footage since, so if you can dig this up, that'd make a great historical rarity to add to your site.
2002 - Lucas receives Honourary BAFTA
2005 - Lucas receives AFI Life Achievement Award
you might also want to check this banner from Toyfare 2007 which lists
2008 - Clone Wars 3D animation
2009 - Live Action TV Series