It will feature three films about people and organisations that have inspired and comforted others in times of need.
In a pre-recorded opening address, Catherine will read extracts from a letter she wrote about love and empathy that was included in the event’s order of service.
She will say: “The Christmas story encourages us to consider the experiences and feelings of others.
“It also reflects our own vulnerabilities and reminds us of the importance of giving and receiving empathy, as well as just how much we need each other in spite of our differences.
“Above all else, it encourages us to turn to love, not fear. The love that we show ourselves and the love we show others. Love that listens with empathy, love that is kind and understanding, love that is forgiving, and love that brings joy and hope.”