Young children are sitting around in a crowd, watching and imitating something.
Some children are at a party.
when children are at party wen cannot say that they are  sitting around in a crowd, watching and imitating something.
exists e2 e3 e1 s1 s2 x1 x2 x3.(for(e1,e3) & Theme(e3,x3) & Actor(e3,x1) & v_imitate(e3) & n_thing(x3) & for(e1,e2) & Actor(e2,x1) & v_watch(e2) & in(e1,x2) & n_crowd(x2) & a_around(s2) & Manner(e1,s2) & Actor(e1,x1) & v_sit(e1) & n_child(x1) & a_young(s1) & Theme(s1,x1))
exists p1 x1.(exists x2.(at(x1,x2) & n_party(x2)) & n_child(x1))