Here's how they describe the event:
No use crying over paid taxes. All you have to do this April 17th is focus on not spilling your ½ price Cherry Limeade. Head to a SONIC® near you to wash away Tax Day with ½ price drinks and slushes.
Only at participating SONIC Drive-Ins. Hours may vary by location.
7 a.m. to 11:30 p.m.
If you purchase a product or register for an account through a link on our site, we may receive compensation. By using this site, you consent to our User Agreement and agree that your clicks, interactions, and personal information may be collected, recorded, and/or stored by us and social media and other third-party partners in accordance with our Privacy Policy.