ACDC, B52's, Billy Idol, Elvis, Righteous Brothers, Elvis Presley, Bill Haley and his comets, Beatles (twist and shout), Marcia Griffiths (electric slide), The McCoys, Bob Seger
That should get you started at least. If you don't know the artists bit hits, just look them up on google and youll know all the big songs by them. I have Dj'd weddings of all age groups quite a long time with my dad, so are just a few off the top of my head. Of course play songs at key points in the night, ie the more people drink, do the more cheesy songs, its hilarious.
***Keep in mind, you have to pick music people actually can dance to, not just think "oh this is a good song". Its a lot tougher than most people realize trying to play music for diverse crowds such as a wedding reception