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We extend the Halo Occupation Distribution (HOD) framework to generate mockgalaxy catalogs exhibiting varying levels of "galactic conformity", which hasemerged as a potentially powerful probe of environmental effects in galaxyevolution. Our model correlates galaxy colours in a group with theconcentration of the common parent dark halo through a "group quenchingefficiency" $\rho$ which makes older, more concentrated halos $\textit{at fixedmass}$ preferentially host redder galaxies. We find that, for a specific valueof $\rho$, this 1-halo conformity matches corresponding measurements in a groupcatalog based on the Sloan Digital Sky Survey. Our mocks also displayconformity at large separations from isolated objects, potentially an imprintof halo assembly bias. A detailed study - using mocks with assembly bias erasedwhile keeping 1-halo conformity intact - reveals a rather nuanced situation,however. At separations $\lesssim 4$Mpc, conformity is mainly a 1-halo effectdominated by the largest halos and is $\textit{not}$ a robust indicator ofassembly bias. Only at very large separations ($\gtrsim 8$Mpc) does genuine2-halo conformity, driven by the assembly bias of small halos, manifestdistinctly. We explain all these trends in standard Halo Model terms. Our modelopens the door to parametrized HOD analyses that self-consistently account forgalactic conformity at all scales.

Correlating galaxy colour and halo concentration: A tunable Halo Model of galactic conformity