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[ABRIDGED] We present the first results from the largest spectroscopic surveyto date of an intermediate redshift galaxy cluster, the z=0.834 cluster RXJ0152.7-1357. We use the colors of galaxies, assembled from a D~12 Mpc regioncentered on the cluster, to investigate the properties of the red-sequence as afunction of density and clustercentric radius. Our wide-field multi-slit surveywith a low-dispersion prism in the IMACS spectrograph at Magellan allowed us toidentify 475 new members of the cluster and its surrounding large scalestructure with a redshift accuracy of dz/(1+z)~1% and a contamination rate of~2% for galaxies with i<23.75 mag. We combine these new members with the 279previously known spectroscopic members to give a total of 754 galaxies fromwhich we obtain a mass-limited sample of 300 galaxies with stellar massesM>4x10^{10} M_sun. We find that the red galaxy fraction is 93+/-3% in the twomerging cores of the cluster and declines to a level of 64+/-3% at projectedclustercentric radii R>~3 Mpc. At these large projected distances, thecorrelation between clustercentric radius and local density is nonexistent.This allows an assessment of the influence of the local environment on galaxyevolution, as opposed to mechanisms that operate on cluster scales. Even beyondR>3 Mpc we find an increasing fraction of red galaxies with increasing localdensity. The red fraction at the highest local densities in two groups at R>3Mpc matches the red fraction found in the two cores. Strikingly, galaxies atintermediate densities at R>3 Mpc, that are not group members, also show signsof an enhanced red fraction. Our results point to such intermediate densityregions and the groups in the outskirts of the cluster, as sites where thelocal environment influences the transition of galaxies onto the red-sequence.

A Wide-Field Study of the z~0.8 Cluster RX J0152.7-1357: the Role of Environment in the Formation of the Red-Sequence