Festivalen blev planlagt fra 14 jun til 18 jun 2017 (4 dag(e)).
Firefly Music Festival finder sted i Dover, United Kingdom. Her er den fulde adresse på festivalen: The Woodlands of Dover International Speedway, Dover
The Weeknd, Muse, twenty one pilots, Alan Walker, Weezer, Glass Animals, Kaleo, Bob Dylan, Illenium, Rainbow Kitten Surprise, Thirty Seconds to Mars, Fletcher, Franz Ferdinand, Stick Figure, Flume.
De mest populære genrer og undergenrer i den foregående udgave var:
pop
electronic
rock
indie
alternative
indie rock
indie pop
alternative rock
electronica
electropop
rnb
experimental
acoustic
electro
new wave
synth-pop
trip hop
dance
dubstep