This theme is just zones. You can use this theme to show simple data on the projector, putting the browser in full screen mode. Or this theme can be used to develop new theme from scratch. Your choice.
Remember that Calendar module records are very short. If you want a longer version of an event description you can always attach an article to a specific event. It can be a news article from your news feed or just a special article you wrote to make a story about what is gonna happen.