Callies' father, Reverend Raymond A. Callies, Sr., is credited with starting the Martin Luther King Jr. Day March in San Antonio that draws hundreds of thousands of people to the East Side today.

SAN ANTONIO - Despite the extremely cold weather, plans are moving forward for Monday morning's Martin Luther King Jr. March here in San Antonio.The march line

Though San Antonio City Hall and municipal offers will be closed on Jan. 20, multiple city services will remain open or partially in service on Martin Luther King Jr. Day.

Discover facts about the first official MLK March in 1987 including 2 famous attendees, plus why San Antonio hosts what's considered the nation's largest march.

MLK March is set to draw thousands Monday to the East Side despite the cold weather, organizers say. By the numbers: Dwayne Robinson, chair of the MLK Commission, previously told Axios the march typically draws 150,

Several events will be held throughout the San Antonio and New Braunfels area in January to honor Martin Luther King Jr., an activist and minister who was assassinated on April 4, 1968.

Amid heightened security concerns, the San Antonio Police Department plans to boost security, restrict drones, at MLK March.

If frozen precipitation enters the forecast at march time, organizers said the event will be moved to the Alamodome. That call will be made Sunday night.