Seattle's annual Martin Luther King Jr. rally and march returns to Garfield High School on Monday, honoring King's legacy. What they're saying: "This is one of the years where we're standing on Dr. King's quote: 'Darkness cannot drive out darkness; only light can do that,'" organizer Shaude' Moore told the Seattle Times.

Arizona was one of the last states to recognize Martin Luther King Jr. Day as a holiday and the only state that required a public vote to do so.

Here's what you need to know about whether U.S. stock markets will be open on Martin Luther King Jr., Day this year.