Feasts of the Assumption in the parts of USA where I spend time are generally Italian. That’s the Italian flag being carried with the US flag and the state flag at the head of the parade. It’s an Italian custom to pin money to Mary’s mantle during the procession, while saying a prayer to her. In this case they just pinned a couple of dollars on her before the procession started, to honor the tradition, and people don’t actually run up to the statue and pin money on her during the procession. But I have attended a much bigger Feast of the Assumption celebration in Cleveland (which may have the biggest one in the country, it runs for several days and takes up a whole neighborhood and has two huge Mary processions and a giant fireworks display on the last day) where people will still go and pin their money on Mary and she has lots of dollars on her by the end of the procession.
This particular procession in the pictures is celebrating its 100th anniversary. It was organized by an Italian lady parishioner who had lost one child to the 1919 flu epidemic and had a second child who was sick. She organized the procession as a way of asking Our Lady to save her sick child and others in the community who were sick. It became a custom over the years.