Rapper Common was in Ferguson, Missouri, visiting where 18-year-old Michael Brown was killed.
A Ferguson police officer shot and killed Brown over two weeks ago.
That shooting sparked days of protests, which sometimes included violence and looting.
Common asked for a moment of silence during an appearance on the MTV Video Music Awards Sunday.
Brown was buried on Monday.
There was a peaceful march the following night.
About 100 people attended.
Police arrested one man for carrying a concealed gun without a permit.