Here is the schedule:
https://www.vatican.va/content/francesco/en/travels/2024/inside/documents/20240428-venezia.html
He will be celebrating Mass in Piazza San Marco at 11 am.
Before that, he will be on Giudecca visiting the women’s prison, and meeting artists and officials of the Bienniale. Then go by boat to Santa Maria della Salute to meet with young Venetians. He will walk across the pontoon bridge that has been set up to reach San Marco.