David Gregory, moderator of NBC’s “Meet the Press,” is hosting a somewhat less political round table than usual tonight at the National Archives’ McGowan Theater. The issue for this evening: food safety, past and present. Panelists will include a trio of wonky health experts and, of course, irrepressible D.C. chef José Andrés. Admission is free. Doors open at 6 p.m. Discussion begins at 7 p.m.