A man who appears to be the band leader is reading from a large white card which he is holding in his left hand, while facing persons holding tubas.
A marching band is playing a show on a football field.
Not all bands are marching bands.The fact that a man who appears to be the band leader is reading from a large white card doesn't imply that the band is playing a show on a football field.
exists e1 e2 p1 p2 s1 s2 s3 x1 x2 x3 x4 x5 x6.(n_hand(x6) & a_left(s3) & Theme(s3,x6) & of(x6,x4) & n_male(x4) & n_male(x4) & n_leader(x4) & of(x4,x5) & n_band(x5) & from(e2,x3) & exists e4 e5 e3 x7 x8 x9.(while(e3,e5) & Theme(e5,x7) & Actor(e5,x4) & v_face(e5) & Theme(e4,x9) & Actor(e4,x8) & v_hold(e4) & n_tuba(x9) & (x7 = x8) & n_person(x7) & in(e3,x6) & Actor(e3,x4) & v_hold(e3)) & which(x3,p2) & n_card(x3) & a_white(s2) & Theme(s2,x3) & a_large(s1) & Theme(s1,x3) & Actor(e2,x1) & v_read(e2) & Topic(e1,p1) & Actor(e1,x2) & v_appear(e1) & exists p3.(x2 = x4) & (x1 = x2) & n_man(x1))
exists e1 e2 x1 x2 x3 x4.(on(e2,x3) & n_field(x3) & of(x3,x4) & n_football(x4) & Theme(e2,x2) & Actor(e2,x1) & v_play(e2) & n_show(x2) & n_band(x1) & Actor(e1,x1) & v_march(e1))