A large crowd watching something while some people dance together in front of a blue stage.
This is the biggest gathering of people in the past four years.
A large crowd is too general of an explanation for the amount of people to determine if it was the biggest gathering of people in the past four years.
exists e1 e2 p1 s1 s2 x1 x2 x3 x4 x5 x6.(in(e2,x5) & of(x5,x6) & n_stage(x6) & a_blue(s2) & Theme(s2,x6) & n_front(x5) & exists s3.(Theme(s3,x1) & a_together(s3)) & Topic(e2,p1) & Actor(e2,x1) & v_dance(e2) & while(e1,x4) & n_people(x4) & Theme(e1,x3) & Actor(e1,x2) & v_watch(e1) & n_thing(x3) & (x1 = x2) & n_crowd(x1) & a_large(s1) & Theme(s1,x1))
exists p1 s1 s2 x1 x2 x4.(n_year(x4) & card_eq_4(x4) & a_past(s2) & Theme(s2,x4) & n_gathering(x2) & r_most(s1) & a_biggest(s1) & Theme(s1,x2) & n_thing(x1) & exists x3.((x1 = x2) & of(x2,x3) & in(x3,x4) & n_people(x3)))