What are your techniques for compartmentalizing experiences?

Here’s why I ask: Yesterday was 75% crazy awesome, with 25% deep suck thrown in. Dance class! Conference call with some producers who I might work with on a TV project! Arrangements made for trip to Portland this weekend for a sponsored journalistic jaunt! Shitty news filled with lots of big potentially life-changing unknowns! Then it’s off to a delicious fancy dinner with friends to celebrate one of them becoming a writer in residence for a local literary organization!

How can one not let super shitty news dampen what is otherwise an awesome day? My technique involved crying in the bathroom for five minutes and then just making the choice: I AM NOT WORRYING ABOUT THIS RIGHT NOW. How do you do it?