Here is a summary of the events that happen in the episode:
1. Opening performance: The episode begins with the New Directions performing "I Lived" by One Republic, celebrating their journey and accomplishments over the years.
2. Rachel's big break: Rachel Berry finally gets her big break as she lands the lead role in a Broadway production of "Funny Girl."
3. Finn's legacy: The group dedicates a performance to their late friend, Finn Hudson, with "Don't Stop Believin'" and "I'll Stand by You."
4. Surprise proposal: During the performance, Blaine surprises Kurt with a proposal, and they happily accept.
5. Flashbacks and reunions: The episode features several flashbacks to memorable moments and competitions throughout the series, including the show choir performances and their ups and downs.
6. Character updates: The episode shows updates on the characters' lives, with some getting married, having children, and pursuing successful careers.
7. Mercedes' tribute: Mercedes Jones honors her late friend, Mercedes, with a performance of "Somewhere Over the Rainbow."
8. Final performance: The episode culminates in the group's final performance together, as they sing "Glory" by Common and John Legend.
9. Graduation and farewell: The episode concludes with the graduation ceremony of the New Directions, bidding farewell to McKinley High School and their close friendships.
10. Epilogue: The episode ends with a montage of the characters' achievements, aspirations, and happy moments, showing their continued success and fulfillment in their lives after high school.