According to aristotle, the events of a tragedy are connected through

1. diction
2. song
3. thought
4. plot

According to Aristotle, the events of a tragedy are connected through cause-and-effect relationships.
A cause-effect relationship is a relationship in which one event or cause makes another event happen.
Hence,
the events of a tragedy are connected through the plot.
Tragedy only happens when there is something wrong,so the plot in dictionary is described as a plan made in secret by a group of people to do something illegal or harmful.