Rabbi Avrohom Baruch Zachariash teaches the halachas of Chol Hamoed with the Mishnah Berurah (O.C. 533). What types of preparations can be made on Yom Tov and Chol Hamoed. Can one use trickery in order to make more that can be used during the week? Can you grind flour on Yom Tov? What if there is a 10kg minimum and you only need 1kg? Can you set a table in the early morning for Shabbos luncheon?