A child that is dressed as Spiderman is ringing the doorbell.
The child is celebrating Halloween.
Just because the child was dressed up and ringing a doorbell does not mean that they were celebrating Halloween.
exists e1 e2 x1 x2 x3 x4.(n_doorbell(x4) & ne_org_spiderman(x3) & Theme(e2,x4) & Actor(e2,x1) & v_ring(e2) & as(e1,x3) & Theme(e1,x2) & v_dress(e1) & (x1 = x2) & n_child(x1))
exists e1 x1 x2.(ne_geo_halloween(x2) & n_child(x1) & Theme(e1,x2) & Actor(e1,x1) & v_celebrate(e1))