Q: "Three men wearing the same black and yellow uniform are blocking another man in a red uniform." Does this mean that "a trio of people wear matching uniforms near someone who doesn't"?
A: yes

Q: "A woman in green uniform skates down the road at the fair." Does this mean that "The lady in green is skating down the street."?
A: yes

Q: "A young man with long black dreadlocks sits down while another person works on them." Does this mean that "The young man is alone, working on his own dreadlocks."?
A: no

Q: "Men, women and children dance at a party." Does this mean that "Men, women and children are dancing at a party with streamers on the ceiling."?
A:
it is not possible to tell