Special Basilica Celebrations

To make clear the particular bond of communion by which the minor basilica is united with the Roman cathedra of Peter, every year there must be celebrated with particular care:

1. the Feast of the Chair of Saint Peter the Apostle (February 22);
2. the Solemnity of Saints Peter and Paul, Apostles (June 29);
3. the anniversary of the Supreme Pontiff's election (13 March 2013 for Pope Francis) or inauguration into the supreme ministry (19 March 2013 for Pope Francis).

 The faithful who devoutly visit the basilica and within it participate in any sacred rite or at least recite the Lord's Prayer and the profession of faith may obtain a plenary indulgence under the usual conditions (sacramental confession, Eucharistic Communion, and prayer for the intention of the Supreme Pontiff):

February 14 - Anniversary day St. Mary of the Angels church was granted title of Minor Basilica
June 29 - Anniversary day of St. Mary of the Angels' consecration (in 1919) and the Solemnity of Saints Peter and Paul
August 2 - Patronal Feast Day and Porziuncola Indulgence granted at the time of St. Francis of Assisi
October 4 - Feast of St. Francis of Assisi; Date selected by Bishop Richard J. Malone, Bishop of Buffalo
A day of the pilgrim's choice once a year 

Source: DOMUS ECCLESIAE (1989)
Conditions for Plenary Indulgence.