This is a photo shoot for the anime, and the game characters are invited as well to take part in this photo shoot/hang out event for Dramatical Murder.....
If you go down the stairs from Riverfront Plaza (where they host the Food Truck Festival), and head left at the bottom of the stairs, you will find some flower and sculpture gardens along the Connecticut River Walk (which also leads to the Riverfront Boat Hours as well as a lovely Gazebo. There are plenty of spaces for groups of up to 40 Cosplayers to take some great photos with beautiful backgrounds!