The Defense Advanced Research Projects Agency (DARPA) Information Innovation Office (I2O) is sponsoring a Proposers Day, to provide information to potential proposers on the objectives of the anticipated Open Programmable Secure 5G Broad Agency Announcement (BAA). DARPA hosts Proposer Days to promote teaming arrangements between researchers, provide potential performers with information on whether and how they might respond to the Government's research and development solicitations, and to increase efficiency in proposal preparation and evaluation. Therefore, Proposer Days are open only to registered potential proposers. This meeting is not open to the general public or members of the media.