Rabbi Avrohom Baruch Zachariash teaches the halachas of PURIM with the Mishnah Berurah (O.C. 690).
00:30 690:1 Read the Megillah standing.
04:05 Why is Megillas Esther read AFTER leining (and all other Megillas are read before).
13:27 If you eat before shofar on Rosh Hashanah, how much can you eat?
16:35 Does the person who is listening to the brocho have to stand, too?
18:40 Moshe had to wait for permission to go into the Ohel Moed.
21:10 Two voices can’t be heard. But not with Megillah.
32:00 The baal koreh has an obligation to lein from the megillah. Do you have an obligation to hear from the megillah (ksav)?
34:05 Does the baal koreh of the Torah have to look inside when he reads a kri/ksiv?