Shake It Up with Late Night Treat This deal is from 2019. It has not been announced for 2020. Sonic Drive-In is giving you chill ways to save this summer. Through September 2, the chain’s ice cream shakes are 50% off after 8 p.m. at participating locations. Choose from many sweet, … [Read more...] about Sonic Drive-In Offers Half-Price Shakes After 8 p.m.