As an Organizer, you own your event data including your registrants/attendees data.
Your registrants will not be contacted by RingCentral unless they agree to receive information about other events hosted on RingCentral that they are interested in. RingCentral Events users control what they want to be contacted about.
Please check the RingCentral Events Service Privacy Datasheet for more information about the way we collect, store, and process data on our platform.