All are assembled inside the church for the prayer.
The church has been empty all night.
Either all the people are in the church or the church is empty; the church cannot be in both conditions at once.
exists x2 x3.(n_prayer(x3) & n_church(x2) & all x1.(n_thing(x1) -> exists e1.(for(e1,x3) & inside(e1,x2) & Theme(e1,x1) & v_assemble(e1))))
exists x2.(n_church(x2) & all x1.(n_night(x1) -> exists s1.(Time(s1,x1) & Theme(s1,x2) & a_empty(s1))))