Girl is playing the guitar in front of a group of people.
The lady was having a concert.
Playing the guitar doesn't imply having a concert.
exists e1 x1 x2 x3 x4 x5.(n_guitar(x2) & ne_nam_girl(x1) & in(e1,x3) & of(x3,x4) & of(x4,x5) & n_people(x5) & n_group(x4) & n_front(x3) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1))
exists e1 x1 x2.(n_lady(x1) & Theme(e1,x2) & Actor(e1,x1) & v_have(e1) & n_concert(x2))