Conversation so far:
when was the final appearance of Lucy Stone?
Lucy Stone went with her daughter to Chicago in May 1893 and gave her last public speeches at the World's Congress of Representative Women
where was the final appearance of Lucy Stone?
The World's Congress of Representative Women was a week-long convention for the voicing of women's concerns, held within the World's Columbian Exposition (Chicago World's Fair) in May 1893.
what was the reason for The World's Congress of Representative Women in May 1893?
At 81 meetings, organized by women from each of the United States, 150,000 people came to the World's Congress, listening to speeches given by almost 500 women from 27 countries

Question: why was it the final appearance?
Self-contained rewrite: why was The World's Congress of Representative Women the final appearance of Lucy Stone?