“Free agent” John Cena is being advertised for a bunch of Raws starting with the Raw after SummerSlam in Brooklyn. He is not being advertised for any SmackDowns after SummerSlam as of now.
The Barclays Center, which will host SummerSlam and the Raw and SmackDown the following nights, also posted this on Twitter:
We're 10 days away from @WWE Monday Night RAW. Don't miss Free Agent @JohnCena live here in Brooklyn on 8/21! #WWEBrooklyn pic.twitter.com/d4dMrsT5eW
— Barclays Center (@barclayscenter) August 11, 2017