MVPIts a bit late - but i would vote for "Enders day" - I would propose Jan 15th as a day as its the release date of the book, actually Ender was born 11BX ~600 years AFTER the recorder virus spread, and 11 years Before Xenocide. takes place .
If one were to read the book or google "key themes to enders game" - you can quickly see how this Sci-fi book relates to leadership, managment, wars, work, moral complexities, and decision making. As you read, assign your current work project similart to the tasks the leaders are putting forth to the students of the school. Everyone has a job to do, however only the person above has the bigger picture. You soon learn that the person above - has another person above with a bigger picture - and they are only clearly communication a portion of what needs done, as they dont have all the answer and are depenednt on the students solving the bigger picture.
On of my top 10 reads.