A group of people, some sitting and some standing, seem to be enjoying a sort of party, as there are streamers and balloons around them.
a group of people at a new years eve party
There is no reason to assume the people are at  a New Year's Eve party, because you do not know if the party took place on New Year's Eve, or had any New Year's Eve decorations.
exists e1 e2 p1 p2 x1 x2 x3 x4 x5 x6.(exists p3 x9 x10 x11 x12.((x9 = x10) & subset_of(x12,x10) & around(x12,x1) & n_balloon(x12) & subset_of(x11,x10) & n_streamer(x11)) & n_thing(x1) & as(e2,p2) & Topic(e2,p1) & Actor(e2,x1) & v_seem(e2) & exists e3 x7 x8.(Theme(e3,x7) & Actor(e3,x1) & v_enjoy(e3) & of(x7,x8) & n_party(x8) & n_sort(x7)) & rel(x1,x3) & subset_of(x6,x3) & n_standing(x6) & subset_of(x4,x3) & Actor(e1,x5) & v_sit(e1) & (x4 = x5) & n_thing(x4) & of(x1,x2) & n_people(x2) & n_group(x1))
exists s1 s2 x1 x2 x3 x4.(a_topic(x1) & at(x1,x3) & n_party(x3) & a_eve(s2) & Theme(s2,x3) & of(x3,x4) & n_year(x4) & a_new(s1) & Theme(s1,x3) & of(x1,x2) & n_people(x2) & n_group(x1))