  The nearly perfect fluid-like nature of the Quark Gluon Plasma may be
understood through two key experimental signatures: collective flow and jet
suppression. Event-by-event relativistic viscous hydrodynamics (with an
extremely small shear viscosity to entropy density ratio) has been very
successful at describing collective flow observables for the last 7 years. More
recently, the effects of event-by-event fluctuations have been studied in the
context of high $p_T$ particles that lose energy as they pass through the dense
Quark Gluon Plasma liquid. In this summary of the corresponding plenary talk at
Quark Matter 2017, the recent developments on the effects of event-by-event
fluctuations on jet suppression are summarized.
