Well, one key event was Joseph's dreams. They were a big deal as they led to his brothers' envy. His brothers' act of selling him into slavery was another major event. When he was in Egypt, facing the situation with Potiphar's wife was important. His ability to interpret Pharaoh's dreams and the resulting rise in his status was a turning point. And then, when his family came during the famine and his revelation to them and their reconciliation was a very important part of the story.
The key events are his dreams which made his brothers jealous. Then his brothers sold him into slavery. His time in Potiphar's house and resisting Potiphar's wife's advances. Interpreting Pharaoh's dreams. Preparing for the famine. And finally, the reunion with his family when they came to Egypt for food.
First, Joseph had those two dreams that showed his family's subservience to him. His brothers' reaction of selling him was crucial. In Egypt, his time as a slave and later as an important figure in the court due to his dream - interpreting skills was key. Also, the famine and how his family came to Egypt seeking help, and his ultimate forgiveness of his brothers were important events.