There are two artists with this name. 1) Funk/disco band from London, UK. 2) Synthwave artist from Germany.
These are photos from concerts where Heatwave played, so they may be of other bands that played the concert as well.
Bestival 2015 Sep 10 - 13, 2015 Downend, Isle of Wight, UK Uploaded by A Badger Faced Man