The term “CE-5” was coined by Dr. Steven Greer, who had two experiences with beings who shared with him the importance of teaching people how to telepathically communicate with Extraterrestrials.
CE-5 is an acronym for: “Close Encounters of the Fifth Kind” The first four kinds of contact, CE-1, 2, 3 & 4, describes ET initiating contact with humans. CE-5 is the reverse: humans initiating contact with ET.
Human initiated contact does predate the protocol that was imparted to him. In our current era of history we are aware of Sixto Paz Wells and the Peruvian Mission Rahma group who started contact in 1974. In the 60s groups of hippies would initiate contact.
As well, shamans of indigenous cultures the world over have a fluid connection to ETs. We can assume in all likely-hood that throughout all of human history some of us along the way have figured out how to make phone calls to outer space.