Participating Sonic Drive-Ins are thanking customers with Free Float Night on Wednesday, June 3.

Specifically, restaurants are giving away 10-oz. Root Beer Floats from 8 p.m. until midnight.  The chain, which has two restaurants in Orange County, expects to hand out more than 3.5 million Root Beer Floats, according to QSR Magazine.

The Sonics in Anaheim and Mission Viejo are participating  in the giveaway.

• Anaheim Sonic is at 1632 N. Lemon Street. Phone: (714) 992-4500.

• The Mission Viejo Sonic is at 25502 Jeronimo Road. Phone: 949-472-4690.