I think if you are doing a timeline, I like the events that pohnpei397 came up with to start. After reaping day, I would include the opening ceremonies, training days, and the interview session. I would definitely include her relationship with Cinna in one of those events as that it is an importnat event in her life. Katniss has very few people she connects with and trusts.
Once the games begin, you could track obstacles for Katniss: search for water, fire, Tracker Jackers.
I hope this gets you going a little more. Think about which events mean something to Katniss and the outcomes of the game -- both physical outcomes and outcomes regarding Katniss's maturation and growth.