1) Baba often went to the flea market with Amir. Which venture are you referring to?
2) Amir and Soraya's traditional courtship creates a little Afghan oasis in the confusion of America, which Baba and the Taheris greatly appreciate. A traditional courtship involves numerous non-personal conversations, no contact, and no open conversations that anyone else might question.
3) Baba refused to prolong his life with chemotherapy and made Amir promise not to tell anyone about his disease. After the diagnosis, Amir and Baba still went to the flea market on Sundays. As the weeks progressed, Baba lost weight and got sicker until one day, he fell on the ground and started having seizures. Baba's overseeing of Amir's marriage gives him a semblance of strength, but he becomes only a shell of his former self.