This week saw two different events commemorated: Nov. 19 was the 150th anniversary of the Gettysburg Address by President Abraham Lincoln, and Nov. 22 was the 50th anniversary of the assassination of President John F. Kennedy. Two presidents, who took office a century apart; who both died at the hands of assassins.
Here is video from the History Channel: http://www.history.com/topics/gettysburg-address/videos#gilder-lehrman-gettysburg-address
Here is a link about the importance of the speech, and the various copies of it in existence: http://www.abrahamlincolnonline.org/lincoln/speeches/gettysburg.htm This site has a lot of really interesting related links at the bottom of the page which are well worth checking out.
Here is an article from The Atlantic: http://www.theatlantic.com/politics/archive/2013/11/the-gettysburg-address-at-150-and-lincolns-impromptu-words-the-night-before/281606/
On the subject of the Kennedy assassination, here is an interesting compilation of links from the Dallas Morning News website– which is where the assassination took place: http://www.dallasnews.com/news/jfk50/