Rita will be using her patented Rita Bead technology to help move detailed information discreetly between participants in this plan. (In the event that there's overlap with Sans' disappearance, she'll make the rounds herself.)

She can't stealth, so if there's only a small group going, she'll stay back. Maybe she and some others can work on some kind of collaborative art while strategically positioned in a place with a good view, so they can see if the away group attracts any pursuers, or if someone comes running back for help / to report something.