TODAY 10 a.m. to 6 p.m. today and Sunday — National Student Activism Conference, Roots of Resistance: Continuing the Struggle, sponsored by KSU student and Kent community organizations. Kent State Student Center. Details: rootsofresistance@gmail.com. Off-campus reunion for Students for a Democratic Society, with local and national leaders including Mark Rudd of the SDS and Weathermen. 7:30 p.m. — Student Center Kiva; premier of a documentary on the history of Kent State activism, Fire in the Heartland by Danny Miller. Free. MONDAY