In Kizhuprakkat et al. we present mock catalogues that reproduce the selection criteria of MWS and the format of the final MWS data set. These catalogues can be used to test methods for quantifying the properties of stellar halo substructure and reconstructing the Milky Way's accretion history with the MWS data, including the effects of halo-to-halo variance. In Adame et al. we report early results from the Dark Energy Spectroscopic Instrument (DESI). In Carlberg et al. we measure the distribution of random velocities in long streams in simulated Milky Way-like halos that develop in representative warm dark matter (WDM) and cold dark matter (CDM) cosmologies. We find that the radial velocity distributions are well modeled as the sum of a Gaussian and an exponential. In Manset et al., we provide spectral classifications for all white dwarfs observed in the DESI Early Data release , and discuss their distribution within the Gaia Hertzsprung–Russell diagram. The DESI EDR white dwarf sample is significantly less biased than the sample observed by the Sloan Digital Sky Survey, which is skewed to bluer and therefore hotter white dwarfs, making DESI more complete and suitable for performing statistical studies of white dwarfs.