One key event is the flashback to the Jallianwala Bagh massacre. It sets the tone for Sardar Udham's quest for revenge. Another is his time in London, where he carefully plans his move against the man responsible for the massacre. And finally, his act of shooting the target in London is a significant event that is the culmination of his years of planning.
The movie 'Son of Sardar' is a comedy. It follows the story of a man who is mistaken for someone else. There are a lot of comical situations, misunderstandings, and family drama involved. It has some great action sequences as well. The lead character has to face various challenges while also dealing with his own identity crisis.
I'm not entirely sure specifically about a 'Karthi Khakee' real story. It could be something relatively unknown or a very specific regional or personal story. Maybe it's a project or an event related to someone named Karthi, but without more context, it's difficult to say.