Several people are drinking and socializing at a party.
People are at a party.
As the people are drinking and socializing it's clear that they are at a party.
exists e1 e2 s1 s2 x1 x2 x3 x4.(at(e2,x4) & n_party(x4) & Actor(e2,x3) & v_socialize(e2) & n_people(x3) & a_several(s2) & Theme(s2,x3) & at(e1,x2) & n_party(x2) & Actor(e1,x1) & v_drink(e1) & n_people(x1) & a_several(s1) & Theme(s1,x1))
exists p1 x1.(exists x2.(at(x1,x2) & n_party(x2)) & n_people(x1))