Graceland was the home of Elvis Presley located in Memphis, Tennessee. The Thirteenth Doctor visited Graceland along with Ryan Sinclair, Yasmin Khan and Graham O'Brien (PROSE: That's All Right, Mama)
When Tim Leicester's friend Steve said their book club was doing a vigil, Tim thought they were going to do a vigil to Graceland. (PROSE: Séance, or Smoking is Highly Addictive, Don't Start)