People in costumes are walking around in the street.
People are walking outside.
It is not necessarily outside that people in costumes are walking around in the street.
exists e1 p1 x1 x2 x3.(n_street(x3) & in(e1,x3) & exists s1.(Theme(s1,x1) & a_around(s1)) & Topic(e1,p1) & Actor(e1,x1) & v_walk(e1) & in(x1,x2) & n_costume(x2) & n_people(x1))
exists e1 s1 x1.(a_outside(s1) & Manner(e1,s1) & Actor(e1,x1) & v_walk(e1) & n_people(x1))