### Human: Write a social media photo caption based on this photo description: people in uniform are holding up flags . a crowd of people walking down a street . a crowd of people standing on a street with a large truck . a crowd of people standing around a building . a large group of people are on a boat . a parade of people riding on the back of a truck . people riding on the back of a truck  ### Assistant: @atlutd MLS Cup Championship Parade in action at Centennial Park.