An impromptu toast among friends.
Friends are at a baby shower.
You can have a toast amongst friends anywhere, not just a baby shower.
exists s1 x1 x2.(a_topic(x1) & among(x1,x2) & n_friend(x2) & n_toast(x1) & a_impromptu(s1) & Theme(s1,x1))
exists p1 x1.(exists x2 x3.(at(x1,x2) & n_shower(x2) & of(x2,x3) & n_baby(x3)) & n_friend(x1))