Well, if you're still talking about E&D's for the Kalmar Union, I can imagine a few things...
In regards to just Margaret:
Domestically, Margaret reformed the Danish currency (replacing the good silver coins with older and worthless copper coins) to the advantage of her and the state. She also recovered hundreds of estates lost to the crown before the reign of Valdemar IV Atterdag. She also treated the Norwegian and Swedish crowns as integral to the Danish state.
Foreign policy wise, she remained neutral. One idea for an event would be a royal marriage, which was negotiated in 1402 between the Kalmar Union and England. It was supposed to be a dual marriage, with Margaret's adopted son Eric of Pomerania and Princess Philippa, daughter of Henry IV of England getting married, along with Eric's sister Catherine wedding Henry, Prince of Wales (the future King Henry V). The deal fell through because Margaret did not want to be involved in a foreign war, and Henry IV was looking to get involved in the Hundred Years' War (which would not be started until after Henry IV's death anyway). Eric still married Philippa four years later, when the English and Nordic Crowns agreed to a defensive alliance.
She did however purchase Gotland from Albert of Mecklenburg and the Livonian Order however, and was said to have purchased Schleswig in a similar manner.
So events and decisions-wise in regards to her reign personally could be drawn from such sources.
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