John Cena is being advertised for two Raw house shows in July: July 15 in Huntington, WV and July 16 in Lexington, KY. He will be taking on Bray Wyatt on both shows.
Cena is expected to be on every SmackDown leading up to SummerSlam after he returns on July 4, but as of now, isn’t currently advertised for any live Raw episodes. Of course, that probably will eventually change with WWE doing the “free agent” angle, with the idea of Cena helping the struggling ratings of both Raw and SmackDown, since he is the top draw on the WWE roster.