Megillah 12: Inserting God into Vashti's Removal
More explication of Megillat Esther, from the description of the king's feast, his guests from Persia and Medea (or the reverse, as the case may be). Plus, the decree against the Jews. Also, extensive discussion on the Vashti story, and why Ahashverosh was so angry with her. Plus, the sources for all the midrashim about how the beautiful Vashti became ugly.