well, it looks to me like someone from the clan Died and they are having a memorial to Honor them...Do NOT be disrespectful as this is a sad occasion....even if you are one of the enemy clans
While it was someone from the DeathNote clan, she was known across the server by a number of different people and different clans. She had an impact on those who knew her, and so a memorial was put together to mourn her passing.
I have seen a few people that are returning to the game after a long hiatus and finding out recently of her passing. Kind of brings the 2011 Summer of Doom and Gloom back for a moment. I miss her.