I'm doing an estate sale for which the homeowner is requiring an RSVP list in order to send a gate code for the sale. I've done that through sign-up genius, and my form there made it clear that anyone who RSVPs will receive a text message with the gate code. How do I create a campaign this way? I'm fine with creating an opt-in list over time, but this is for a sale that starts tomorrow so I don't have the luxury of time.
