List of attendees provided by the White House. The three in bold spoke after the President and Christie. Solomon is also a recovering addict, even though he's not listed that way here. Garozzo's son overdosed on opioids.
As previously noted, Christie, Sessions and Rosenberg (DEA) also made remarks at the request of the president.
Governor Chris Christie
Attorney General Jeff Sessions
Secretary Betsy DeVos
Secretary David Shulkin
Secretary John F. Kelly
Dr. Don Wright, the Acting Assistant Secretary for Health, HHS
Charles "Chuck" Rosenberg, Acting Administrator of the Drug Enforcement Agency
Richard Baum, Acting Director of the Office of National Drug Control Policy
Mariano Rivera, Former New York Yankee and founder of the Mariano Rivera Foundation
Pam Bondi, Attorney General, Florida
Bertha Madras, Professor of Psychobiology in the Department of Psychiatry at Harvard Medical School and former Deputy Director for Demand Reduction (prevention, treatment) in the White House Office of National Drug Control Policy
Pam Garozzo, Drug Awareness Advocate
AJ Solomon, Founder of Victory Bay Recovery Center
Vanessa Vitolo, Recovering Addict