A group celebrates a marriage.
A couple has gotten married.
marriage indicates that the couple are married.
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_celebrate(e1) & n_marriage(x2) & n_group(x1))
exists e1 p1 x1.(exists e2.(Theme(e2,x1) & v_marry(e2)) & Topic(e1,p1) & Actor(e1,x1) & v_get(e1) & n_couple(x1))