August 21, 2012 No Comments Reminder: FREE Flan at Taco Cabana on 8/21 August 21 is National Flan Day. And to celebrate Taco Cabana will be giving away FREE Flan at participating Taco Cabana locations on August 21 from 5pm-8pm. No coupon required. Locations. FREE Flan at Taco Cabana on 8/21 -EXPIRED Facebook Twitter Add Comment Notify me of follow-up comments by email. Notify me of new posts by email.