  Following an explicit example, we present the chain of steps required for an
event-by-event description of hadron production in high energy hadronic and
nuclear collisions. We start from incoming nuclei, described in the Color Glass
Condensate effective theory, whose collision creates the gluon fields of the
glasma. Individual gluons are then sampled from the gluon fields' Husimi
(smeared Wigner) distributions, and clustered using a new spacetime based
algorithm. Clusters are fed into the Herwig event generator, which performs the
hadronization, conserving energy and momentum. We discuss the physical
implications of smearing and problems with the quasi particle picture for the
studied processes. We compute spectra of charged hadrons and identified
particles and their azimuthal momentum anisotropies, and address systematic
uncertainties on observables, resulting from the general lack of detailed
knowledge of the hadronization mechanism.
