What version of the OS did you have before? Was is one of the 10.6.x's? If you had a 10.6.x before you aren't going to notice much change with 10.6.8. I'm not sure what that "system events" thing is you are talking about. Maybe some else who installed 10.6.8 can chime in (I use 10.6.5).
I thought 10.6.8 only came as a combo updater. That's still a single disk. So I assume that's what you purchased (purchased? it should have been in your system updates).
Maybe you are confused by the upcoming Lion OSX which has not been released yet where the descriptions talk of new features.