A group of children is performing a concert outside.
A group of children is performing outside in front of their parents.
outside. doesn't always mean  in front of their parents.
exists e1 x1 x2 x3 x4.(Theme(e1,x3) & Actor(e1,x1) & v_perform(e1) & n_outside(x3) & of(x3,x4) & n_concert(x4) & of(x1,x2) & n_child(x2) & n_group(x1))
exists e1 s1 x1 x2 x3 x4.(in(e1,x3) & of(x3,x4) & n_parent(x4) & of(x4,x1) & n_thing(x1) & n_front(x3) & a_outside(s1) & Manner(e1,s1) & Actor(e1,x1) & v_perform(e1) & of(x1,x2) & n_child(x2) & n_group(x1))