As an historical event associated with this week, Lincoln's death (April 15) is at the tipping point and may disappear. The week is taking on an entirely different significance.April 15: Lincoln's death (1865). 
April 16: Virginia Tech massacre (2007). 
April 17: Lundgren cult brutally kills the Avery family (1989). 
April 18: Beirut bombing of U.S. embassy (1983).
April 19: Waco (1993). Oklahoma City bombing (1995).
April 20: Columbine massacre (1999).
There is a thread that connects these events (excepting Waco): atrocity staged as drama.
"Booth immortalized himself by staging one of history's greatest dramas," Kauffman writes. "In the process, he accomplished what every actor aspires to do: he made us all wonder where the play ended and reality began."(Lincoln in state - photo via Ron Rietveld)