I have always thought of tragedies as sad stories. Romeo and Juliet comes to mind when I think of them. I'm not certain if it is a tragedy, but it fits my notion of what a tragedy might be. I also seem to remember talking about tragedies freshman year and hearing that the colloquial definition of tragedy does not match the literary definition, but I could be remembering incorrectly. A tragedy in the sense of events is usually a devastating event that causes grief for people and isn't easy to recover from.
After doing a bit of research, I think it was safe to assume that tragedies usually have a sad story or event. It appears, however, that tragedies usually have a sort of good feeling at the end that releases the audience. This is contrary to what I thought since I believed the point of tragedies was to evoke bad feelings in the audience. It also appears that tragedies are generally written as plays. You can find more on the enigmatic literary manifestation that is the tragedy on Wikipedia here.
Write something about yourself. No need to be fancy, just an overview.