At Town Center Mall, 400 Ernest W. Barrett Parkway, N.W., Kennesaw, GA 30144. First Sunday of each new month, year round. Show starts at 9:00am till 12:00am . WHAT IS CAFFEINE & OCTANE? Caffeine and Octane is a nationally recognized all makes, all models car show that regularly attracts over 2500 muscle, classic, high performance and exotic cars. For more than ten years, Caffeine & Octane has been the #1 choice for car enthusiasts who want to proudly display their amazing vehicles. You will see a new mix of cars every single month and likely something with an engine and wheels that you have never seen before. Caffeine & Octane is a family friendly event and free to attend for all.