The Nashville Flea Market is held at the Tennessee State Fairgrounds on the fourth Saturday weekend of each month, except in December, when the Flea Market is held on the third weekend. LOTS of vendors selling gifts, antiques, collectibles, jewelry, arts and crafts, and anything else you can think of! Admission is FREE! Onsite parking is $5.00 (free if you have a handicap license plate or hang tag), but there is lots of free street parking within walking distance.
BTW - I chose to list this as a "Local Custom" rather than "Shopping" because it is only an option for you one weekend a month.
Held annually the second Thurs-Sun in June, the CMA Music Festival is great fun. Most of the downtown activities/concerts are FREE - several stages of live music, vendors giving free samples (Ice Cream!!), and other things to see and do. If you opt for the 4-day pass (available for about $130 per person), you also get: access to the Autograph lines, where you can meet your favorite country music stars, get an autograph and have your picture taken with them; access to the photo lines at the Riverfront and LP Field stages ( right up at the stages for the best photos of your favorite artist as they perform), and access to the nightly "headliner" concerts at LP Field - these concerts feature 6-8 stars PER NIGHT! Single night passes for the LP Field concerts are available for $40/night, so if you plan on attending all four nights, it is cheaper to just get the 4-day pass and get all the other stuff too.
Definitely consider attending - but if you do, remember to stay hydrated (beer doesn't count!), wear sunscreen and a hat (does not have to be a cowboy hat!), and go inside periodically to cool off. And whatever you do, DO NOT forget your camera - you never know who will be walking past you! :-)
Unfortunately the greasy, fat food and also the slowness of life of the South changes people's shapes into obese shapes. Nashville is not an exception from this Southern fenomena.