Crowds are forming early on Philadelphia's Benjamin Franklin Parkway for another papal parade and an outdoor Mass, hours before they are set to begin.
Visitors are already packed in as tight in the front of the viewing section as they were for the start of closing festival Saturday of the World Meeting of Families.
Organizers have begun making adjustments to security checkpoints to ease wait times for people waiting in lines that stretch for several blocks. One checkpoint that had been reserved for pilgrims with tickets to the best seats for the papal Mass has been opened to the general public.
But wait times varied greatly, with some attendees reporting long waits behind thousands of people, while others sailed through different checkpoints.
The 4 p.m., Eastern time, Mass is expected to draw more than 1 million people.
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