SACRED SITES: Touba, Senegal. The French seemed invincible in the 1880s, but from the depths of the Sahara Desert emerged Sheikh Amadou Bamba, a Muslim holy man, who inspired hundreds of thousands of followers to rise up against the French Imperialists and reach an historic compromise. Presented by Dr. Ronald J. Brown. Sponsored by the Friends of the Library. 3 p.m.