Time management: How do you do it?

I use to have problems with keeping my schedule under control. For instance, one time I to be at a council meeting at two and take work off so that I could be at it and then be back to work just so I could leave in thirty minutes to leave for my sons school performance. I almost missed all three because I wasn't managing my time accordingly. I was lucky to find some virtual administrative assistant information that directed me to a site that, once used made my schedule look much cleaner and proficient.