A crowd of people in the street at night.
A crowd protesting at night.
The sentence don't necessarily imply that the people are protesting. They can be in the street for partying or just
exists x1 x2 x3 x4.(n_street(x3) & a_topic(x1) & at(x1,x4) & n_night(x4) & in(x1,x3) & of(x1,x2) & n_people(x2) & n_crowd(x1))
exists e1 x1 x2 x3.(a_topic(x1) & at(e1,x3) & n_night(x3) & Actor(e1,x2) & v_protest(e1) & (x1 = x2) & n_crowd(x1))