A crowd of standing and sitting people taking their own pictures with multiple cameras.
People gather for a group portrait.
Everyone taking pictures does not mean they are gathering for a group portrait.
exists e2 e1 s1 s2 s3 x1 x2 x3 x4 x5 x6.(a_topic(s1) & subset_of(x3,s1) & Theme(e2,x5) & Actor(e2,x4) & v_take(e2) & with(x5,x6) & n_camera(x6) & a_multiple(s3) & Theme(s3,x6) & n_picture(x5) & a_own(s2) & Theme(s2,x5) & of(x5,x1) & n_thing(x1) & (x3 = x4) & n_people(x3) & Actor(e1,x3) & v_sit(e1) & subset_of(x1,s1) & of(x1,x2) & n_standing(x2) & n_crowd(x1))
exists e1 x1 x2 x3.(for(e1,x2) & n_portrait(x2) & of(x2,x3) & n_group(x3) & Actor(e1,x1) & v_gather(e1) & n_people(x1))