Back in the Day K Share: Non-Profits Back in the Day K Visit Website Mt. Juliet, TN 37122 (615) 389-9171 Facebook About Rep Info Map About The Back in the Day K is an annual 70's themed 15K run, 10K run, and 5K walk/run for charity in Nashville, Tennessee. This event is great for families and pups and it's for the GROOVY. Whom to Contact Eric Mitchell Phone: (615) 389-9171 Send an Email What's Nearby? Distance: 5 10 15 20 25 50 mi.