Events in April 2021 April 17, 2021 - National Mustang Day - Happy Birthday Mustang National Mustang Day - Happy Birthday Mustang National Mustang Day - Happy Birthday Mustang Happy Birthday, Mustang! National Mustang Day website iCal Google Calendar More about National Mustang Day - Happy Birthday Mustang Share this:Click to print (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on Reddit (Opens in new window)