  We explore the notion of events at the intersection between quantum physics
and gravity, inspired by recent research on superpositions of semiclassical
spacetimes. By going through various experiments and thought experiments --
from a decaying atom, to the double-slit experiment, to the quantum switch --
we analyse which properties can and cannot be used to define events in such
non-classical contexts. Our findings suggest an operational, context-dependent
definition of events which emphasises that their properties can be accessed
without destroying or altering observed phenomena. We discuss the implications
of this understanding of events for indefinite causal order as well as the
non-absoluteness of events in the Wigner's friend thought experiment. These
findings provide a first step for developing a notion of event in quantum
spacetime.
