Trying to help you plan ahead :o) The Feast of the Exaltation of the Cross is September 14. Make cross cookies with your favorite sugar cookie or gingerbread cookie recipe. If you don't have a cross cookie cutter, just make your own cross shapes.
Check out these cool ideas:
I think I'll try this one with my 1st & 2nd graders at school:
Pray the Chaplet of the Seven Sorrows of Mary (feast of Our Lady of Sorrows is Sept 15):