Missingness in Action is a consensus conference on the topic of absent and missing data and the future of AI in healthcare. Our goal is to bring together great minds to dive deeper into the critical and emerging issue of missing and non-representational data. We hope to scope the problem, identify solutions, and create a research agenda that might help improve and not worsen existing care gaps for our patients. Content will be relevant to practitioners, researchers, executives, policymakers, and professionals, with and without technical expertise.