This is a group of young adults at a party and they are all having fun.
100 people at a party
A group doesn't necessarily equal 100 people.
exists e1 p1 s1 x1 x2.(n_thing(x2) & a_all(s1) & Manner(e1,s1) & Theme(e1,x1) & Actor(e1,x2) & v_have(e1) & n_fun(x1) & exists s2 x3 x4 x5.((x1 = x3) & of(x3,x4) & at(x4,x5) & n_party(x5) & n_adult(x4) & a_young(s2) & Theme(s2,x4) & n_group(x3)) & n_thing(x1))
exists x1 x2.(a_topic(x1) & at(x1,x2) & n_party(x2) & n_people(x1) & card_eq_100(x1))