Trayvon Martin

Martin Family Photos via AP Photos

Hundreds of people are expected to gather at the federal courthouse in downtown Seattle Saturday as part of a Justice for Trayvon Martin National Day of Action.

The noon vigil will include Martin's cousin, Cedric Martin of Tacoma. It's being held as part of the Rev. Al Sharpton's nationwide Justice for Trayvon Martin Day, which is expected to include 100 cities across the country.