Conversation so far:
When did they meet?
She met the lawyer and anti-apartheid activist Nelson Mandela in 1957, when he was still married to Evelyn Mase.
What happened next?
She was 22 years old and standing at a bus stop in Soweto when Mandela first saw her and charmed her, securing.
Did they start dating?
securing a lunch date the following week.

Question: When did they marry?
Self-contained rewrite: When did Winnie Madikizela-Mandela and Nelson Mandela marry?