This special issue introduces readers to collaborative event ethnography (CEE), a method developed to support the ethnographic study of large global environmental meetings. CEE was applied by a group of seventeen researchers at the Tenth Conference of the Parties (COP10) to the Convention of Biological Diversity (CBD) to study the politics of biodiversity conservation. In this introduction, we describe our interests in global environmental meetings as sites where the politics of biodiversity conservation can be observed and as windows into broader governance networks. We specify the types of politics we attend to when observing such meetings and then describe the CBD, its COP, challenges meetings pose for ethnographic researchers, how CEE responds to these challenges generally, and the specifics of our research practices at COP10. Following a summary of the contributed papers, we conclude by reflecting on the evolution of CEE over time.