Based on the context and the answer, generate a question. 

Context: H - D Image of the Day - Today 's image comes from of course , the Harley - Davison 105th Anniversary Parade . Thousands of people lined Wisconsin Ave . and Milwaukee St. to greet and thank over 7500 riders from all over the world for visiting Milwaukee . As for the parade a separate slideshow has been set - up with 105 images .

Answer:

For visiting the city .



What may be the reason why the riders were thanked ?