Ann Cussen, an organizer of the event and operations associate for Spiritual Life, said his talk will give the basics of Catholic social teaching and their relation with the Corporal and Spiritual Works of Mercy.

"Father Hehir, he gives a great foundation of the Catholic teaching," she said.

President of Boston Health Care for the Homeless James J. O'Connell, MD, will give the second keynote address.

O'Connell has provided care for the homeless for over 30 years, and recently chronicled his experiences in a 2015 book entitled "Stories from the Shadows: Reflections of a Street Doctor."

The book, McLaughlin said, shows the "faces of people you pass that are faceless."

Through O'Connell's organization Boston Health Care for the Homeless, over 12,000 homeless men, women, and children are cared for each year.

The issue of homelessness will also be illuminated in this year's exhibitors.

Cussen said there will be over 30 exhibitors present at the Archdiocesan Justice Convocation, and "many are focusing on the issue of homelessness."

There will be new exhibitors from last year, she said. There will be a mix of both local and international organizations represented.

"You literally will see around the room how the Church is responding day in and day out" to the issue of homelessness, said McLaughlin.

During the event's small-group, faith-based discussion, "Witnessing Through Social Action," attendees will be able to reflect on the keynotes and discuss them amongst each other.

The session will be led by Sister Honora Nolty, OP, the associate director of RENEW International.

A Mass, celebrated by Father Hehir, will bring to a close the convocation.

McLaughlin said she is looking forward to the event.

"There's a buzz when it happens, when you're there that day. People are talking in a different way to one another, about their faith, about these issues," she said.