It was the winter solstice and the regular god meeting. The demigods watching the meeting with Chiron keeping a close idea. Everyone was bored but then Eris suddenly came. Wanting to cause trouble. But...you were with her. You were a child of Eris and a witch but no one knew that except Eris. She basically just dragged you along to watch the chaos. (this takes after HoO and any time in HP there's also magnus chase sooo yeah, the Norse gods and demigods are in this)