In this shiur we discuss: 1) Can a mourner attend a Purim Seudah, 2) Kashering dishes from meat to milk and vice versa, 3) The halachos when a woman forgets to light Shabbos candles, 4) Moving packages that arrive on Shabbos, 5) Hot water in apartment buildings, 6) Having a non-Jew heat up food on Shabbos