found: Merriam-Webster online, Oct. 26, 2018:press conference (an interview or announcement given by a public figure to the press by appointment) news conference (see Press conference)
found: OED online, Oct. 26, 2018:press conference (noun: an interview given to journalists in order to make an announcement or answer questions) news conference ([in entry for news; no definition provided])
found: Radio form/genre terms guide, via WWW, Nov. 14, 2007(Press conferences: Collective interviews granted to journalists by political figures or others in the public eye)
found: Yee, M.M. Moving image materials, 1988:p. 77 (Press conferences: use for nonfiction film or videos used to record collective interviews granted to journalists by political figures or others in the public eye)