People in the street celebrating something.
People are celebrating outside.
"in the street" implies that the people are outside.
exists e1 x1 x2 x3 x4.(n_street(x2) & a_topic(x1) & Theme(e1,x4) & Actor(e1,x3) & v_celebrate(e1) & n_thing(x4) & (x1 = x3) & in(x1,x2) & n_people(x1))
exists e1 p1 x1.(exists s1.(Theme(s1,x1) & a_outside(s1)) & Topic(e1,p1) & Actor(e1,x1) & v_celebrate(e1) & n_people(x1))