131115 is an imaginative event that was held on December 13, a month after the Paris attack to remember the loss of Paris attack on Friday November 13, 2015. Most of attacks occurred in central Paris where people were enjoying Friday night.
I was depressed by this attack as an ex-resident of attacked sharing the same sense with victims. 131115 attendees will share the same music that victims listened to at the last moment of their life and same food that victims had at their last moment. Dress code is casual as one goes out on Friday but in black.