Monday is both Inauguration Day and Martin Luther King Jr. Day. Why it matters: The U.S. Postal Service, stock markets, banks and many schools are closed for the federal holiday, but not because it's the day President-elect Trump is sworn in as the 47th president.

Martin Luther King Jr. Day, this year celebrated on Jan. 20, was established as a holiday in 1983 to honor the legacy of the civil rights leader. Organizations across Long Island are offering opportunities for learning and service. Please call or email to confirm events.

As people prepare to celebrate Rev. Martin Luther King Jr.'s legacy, here’s what to know about what’s open and closed on MLK Day in Oregon.