All of people's wealth is allocated to them during the time between Rosh Hashanah and Yom Kippur, except for the sums that are put toward Shabbat and the holidays and talmud Torah, which are not to be deducted from that allocation. Also, a dispute between Hillel and Shammai - how they treated each day and related to the preparations for Shabbat. Plus, the role of Shabbat as a covenant, even a private one. Also, the extra soul that is present on Shabbat. Plus, going back to eruv tavshilin, and pushing its limits.