An impromptu toast among friends.
People are holding up their drinks.
Holding up their drinks is rephrasing of impromptu toast.
exists s1 x1 x2.(a_topic(x1) & among(x1,x2) & n_friend(x2) & n_toast(x1) & a_impromptu(s1) & Theme(s1,x1))
exists e1 s1 x1 x2.(a_up(s1) & Manner(e1,s1) & Theme(e1,x2) & Actor(e1,x1) & v_hold(e1) & n_drink(x2) & of(x2,x1) & n_thing(x1) & n_people(x1))