HYANNIS, Mass. — Several events will be held in Hyannis to mark the 100th anniversary of the birth of President John F. Kennedy.The slain 35th president would have turned 100 on Monday, May 29.A Mass will be held Monday at St. Francis Xavier Church. It is the same church Kennedy's parents — Rose and Joe Kennedy — attended after buying their home in Hyannis Port in the 1920s.