(Photo: Hannah Whitaker/New York Magazine (Kérastase); Courtesy of Mark Garrison Salon (salon))

On May 20, luxe hair-care brand Kérastase is footing the bill for blowouts and treatments (normally $100) at two city salons in the hope that customers will be won over by its pricey products. Make an appointment at De Berardinis or just walk into Mark Garrison—if there’s no availability at the latter, you can get a rain check (8 a.m. to 5 p.m. Mark Garrison, 108 E. 60th St., nr. Park Ave.; 212-400-8000; De Berardinis, 155 W. 21st St., nr. Seventh Ave.; 212-967-0927).