The World Meeting of Families in Philadelphia in 2015 will serve as a forum for debating issues on the agenda for the world Synod of Bishops the following month.
Iraq's ambassador to the Holy See said the pope could be a target for the Islamic State, but the Vatican says Francis faces no specific threat.
Francis Chronicles: "The love of Christ ... is able to sustain their love and to renew it when, humanly speaking, it becomes lost, wounded or worn out."
The Vatican confirmed that Pope Francis is planning to visit Turkey "in the last days of November," but said the length of his trip and his agenda in the country have yet to be determined.
Jesuit Fr. Federico Lombardi, the Vatican spokesman, made the announcement to reporters Friday, noting that a formal invitation from Turkish President Recep Tayyip Erdogan had arrived at the Vatican earlier in the day.
In light of "countless requests from every part of the world," Pope Francis has approved putting Sts. John Paul II and John XXIII on the church's universal calendar of feast days.
Called the General Roman Calendar, it is the universal schedule of holy days and feast days for the Latin rite of the Catholic church.
The two saints' feast days, both of which have the ranking of an optional -- not obligatory -- memorial, are Oct. 11 for St. John XXIII and Oct. 22 for St. John Paul II.
Among the men and women Pope Francis is set to unite in marriage are Catholics who have been living together as well as couples who already have children.
The pope will preside over his first wedding ceremony as pontiff during a nuptial Mass on Sunday in St. Peter's Basilica.
The event, which will see 20 couples from the Rome diocese celebrate the sacrament of marriage, was organized by the vicariate of Rome.
"Those who will get married Sunday are couples like many others," the diocese said in a press release Wednesday.
"For a pontiff who shows boldness in other areas, when it comes to abuse, he moves very slowly and timidly. Bolder measures are needed."
Fr. Robert Oliver will be the secretary of the Pontifical Commission for the Protection of Minors, which is tasked with laying out a pastoral approach to preventing abuse.
Christians are called to help those who have nothing to give and love those who don't love back, Pope Francis said.
Salvation and changing the world for the better require "doing good to those who aren't able to repay us, just like the Father did with us, giving us Jesus," the pope said at his weekly general audience Wednesday in St. Peter's Square.
Pope Francis will visit Turkey in November, eight years after his predecessor, Pope Benedict XVI, made a landmark visit to the predominantly Muslim country.
Turkey's newly elected president, Recep Tayyip Erdogan, extended a formal invitation to Francis, and the Turkish Embassy to the Holy See confirmed Tuesday that the pope has accepted.
"The pope has been invited by both the Orthodox Church and the government and he is expected to meet the president during his visit," an embassy representative said.