A variety of art displayed on the city streets.
A musical concert is going on.
Art displayed on city streets can't be a musical concert at the same time.
exists e1 x1 x2 x3 x4.(n_street(x3) & of(x3,x4) & n_city(x4) & on(e1,x3) & Theme(e1,x1) & v_display(e1) & of(x1,x2) & n_art(x2) & n_variety(x1))
exists e1 s1 s2 x1.(a_on(s2) & Manner(e1,s2) & Actor(e1,x1) & v_go(e1) & n_concert(x1) & a_musical(s1) & Theme(s1,x1))