Green Mary, based in Napa, CA consults on and manages green events, from recycling/composting stations with personnel to green food vendor outreach to tracking and reporting what was diverted from the landfill. Her website provides a good overview of all the aspects to consider in producing a truly green event.
UC Santa Cruz Zero Event Guide: Tips from UC Santa Cruz Zero Waste Team on planning zero waste events and tracking diversion rates. Their goal is for UCSC to achieve Zero Waste by 2020.
EcoCycle: One of the largest non-profit recyclers in the US, and located in Boulder, CO, their website gives short, to-the-point information on basic materials needed (compostable tableware, compostables collection containers, signage, etc.) and speaks to the importance of using a commercial composter.