It'll be on the second night. On the first night, the stars emerge at midnight. So most characters will have time to kill someone in the time between the Emergence's beginning and the party. Though anyone can choose to not emerge yet, which could be interesting as well.

EDIT: Alright IC is up! First posts can be introductions, what your character did the night of the Emergence, etc. The party will begin next round of posts. If anyone is having trouble with a first post let me know and I'll see if I can help you out! 

This should be good :)