Drybar, a popular salon chain specializing in hair blowouts, does not appear to offer a specific birthday discount or deal. However, they do provide various promotions and special offers throughout the year. Customers can sign up for the Drybar mailing list to receive news and updates on upcoming deals and events. While a dedicated birthday discount may not be available, keeping an eye on their promotions and being subscribed to their newsletter can help clients take advantage of any available deals to enjoy a fabulous hair experience at Drybar.