During the phone tutorial, call Janus. You should end up going on a date with him. After that ends, give Hugo a call once. Then call Janus again. The game should offer you the option to skip to Halloween day, and you're all set!
In the most up-to-date version of the game, it appears after the main story's "to be continued..." screen. Takes a second or two to appear after the scene goes black.
