I gout you bro. Have sex with Bree and Sasha one after the other then have a three-way with both. This should trigger the event. In the morning you will have sex again with Bree and Sasha then Miami will come in afterwards looking for fun DONT have sex with her. She will ask if your being intimate with the other girls SAY YES. this will prompt her to ask for a foursome with them. ask the girls and when they say yes wait until they are all home at 20:00. the event should start. If you already did this event and messed it up you need to redo the game to get it.