I am going to need about 7 to 10 people for this. It's a goth club run by demons. Only the people who come to party there do not know that. On the full moon of every month the doors are closed and locked at a certain time. When that happens, the people inside are trapped and unaware of their impending doom. After the doors are locked tight, the demons start to chase and eat the humans until they are completely full. Which, knowing demons, can be a while. The humans that do survive get their memories wiped completely clean of the horror as soon as they step through the doors. With the spell put on the building, nobody is aware that anyone has gone missing. As for if you want your demon to be male or female, it does not matter.