Oscars.
I'm a glutton for those award shows, I always watch the Golden Globes and the Emmy Awards also. They always start at 2 am here and last until 6 am. (Yawn.) But me and my sis always make a night out of it. I have to steal my dad's cable box though, since we don't get E! and ProSieben (German channel that airs the shows) on our regular cable box.
I don't think ProSieben airs the Grammys. I have to check that, I love that show also, but I usually watch clips and pics the day after.