A young child, wearing a blue shirt and green hat, is blowing up an orange balloon.
A boy gets ready for his birthday party by blowing up balloons
The young child could refer to a child of either gender, not just a boy.  The fact that he is blowing up an orange balloon does not imply that the boy gets ready for his birthday party, he could easily be preparing for another event.
exists e1 e2 s1 s2 s3 s4 x1 x2 x3 x4 x5 x6.(for(e1,e2) & Theme(e2,x4) & Actor(e2,x1) & v_wear(e2) & n_hat(x6) & a_green(s4) & Theme(s4,x6) & n_shirt(x5) & a_blue(s3) & Theme(s3,x5) & subset_of(x6,x4) & subset_of(x5,x4) & a_up(s2) & Manner(e1,s2) & Theme(e1,x2) & Actor(e1,x1) & v_blow(e1) & n_balloon(x2) & of(x2,x3) & n_orange(x3) & n_child(x1) & a_young(s1) & Theme(s1,x1))
exists e1 e2 p1 s1 x1 x2 x3 x4.(by(e1,e2) & a_up(s1) & Manner(e2,s1) & Theme(e2,x4) & Actor(e2,x1) & v_blow(e2) & n_balloon(x4) & for(e1,x2) & n_party(x2) & of(x2,x3) & n_birthday(x3) & of(x2,x1) & n_male(x1) & exists s2.(Theme(s2,x1) & a_ready(s2)) & Topic(e1,p1) & Actor(e1,x1) & v_get(e1) & n_boy(x1))