Benedict XVI will shortly celebrate Mass for an expected million people in the Plaza de la Revolución in Havana (live blog, live video). Cardinal Keith O'Brien and Archbishop Vincent Nichols are to speak at a major event in Rome on Friday marking the 30th anniversary of the establishment of full diplomatic relations between Britain and the Holy See (PDF of programme). A lawyer representing Bishop Robert Finn of Kansas City-St Joseph has argued that the bishop "had no statutory duty to report" suspected clerical abuse. Thomas Peters explains why Catholics are failing at online activism and what can be done about it. George Weigel praises Mary Eberstadt's new study of the "human costs of the sexual revolution". A clinical psychologist, an English professor and a priest reflect on the "floating sacrament" of Confession. And Fr Robert Barron reveals why he is haunted by The Hunger Games.