Location: Knight's Encampment
What Happened? is part of the Main Questline for humans in the starting area of the Knight's Encampment. It is a simple messenger quest given automatically after completeing the quest Wake Up and requires you to visit Adam, one of the Champion knights stationed there.
Quest Start: Automatically (After completeing Wake Up)
After the events of the night before, your character is directed to the Champion, Adam, by Lady Vestry to find out what has become of Lord Porter. Adam is located along the road north leading through the Knight Encampment. Simply speak to him to continue and complete the quest.
Quest End: Adam (Knight's Encampment)
Upon completion, this quest leads into the quest Small Comfort.