A big one is the women's marathon which will start at 6am EDT on Sunday.
The 2008 Women's Olympic was one of the best sporting events I have ever watched. 38 year old underdog Constantina Dita of Romania took the lead early. The announcers dismissed her immediately, saying she had no chance and would not hold on. It was so satisfying to watch her prove them wrong and go on to win gold.
Shannon put together the spectator guide below to enhance your viewing pleasure.
Here is a link to the full spreadsheet.