Mixed Signals

Mixed Signals is a quest started after your entire team is gathered at the fountain, you will initiate in dialog with Elder Elijah, where he will explain to the Courier, about the gala and the opening of the Sieera Madre, this will bring you to a point where you scatter your team through the area, putting them in specific places so that you can continue onward with getting into the Casino.

Dog/God
Dog is meant to go to a spot where he is able to flip power switches in a specific sequence in order for the fireworks to work at the Gala Event. Once he arrives, if he is God, you can convince him that you will come back for him, or lie saying the same thing. If you choose to come back for him, you will need to kill at least two of the 'residents' and bring back their remains so that he can keep Dog fed and contained. Should you lie, you have the option of locking the gate via a terminal just outside the courtyard.

Dean Domino
Dean Domino has to be lead to a balcony where he can complete the circut for the speaker system by bridging the wires with his own body. He will refuse to leave unless you can activate the hologram guards at two nearby terminals.

Christine
There is a room Christine has to be lead to with a fuse box, a locked door and a radio behind said door. In order to open the door, you need to find the fuses. One can be found in a toolbox in the same room. Another can be found in a toolbox on the roof where Father Elija's radio signal can be picked up. The other seems to be above a door to the service route (which requires a key), placed behind a gate with a Very Hard lock on it. The gate is in the middle of a gas field.