People in a marketplace doing christmas shopping
people are halloween shopping
People are either doing christmas or halloween shopping, but not both simultaneously
exists e1 x1 x2 x3 x4 x5.(a_topic(x1) & Theme(e1,x4) & Actor(e1,x3) & v_do(e1) & n_shopping(x4) & of(x4,x5) & n_christmas(x5) & (x1 = x3) & in(x1,x2) & n_marketplace(x2) & n_people(x1))
exists p1 x1.(exists s1 x2.((x1 = x2) & n_shopping(x2) & a_halloween(s1) & Theme(s1,x2)) & n_people(x1))