In October of 2026, an international community of investigators including undergraduates, technicians, graduate students, postdocs, and faculty will convene for the 29th Developmental Biology of the Sea Urchin and other Marine Invertebrates (DBSUMI) conference at the Marine Biological Laboratory. Topics will span developmental biology, including oogenesis, egg activation, fertilization, axis specification, gene expression, organogenesis, cell signaling, regeneration, skeletogenesis, evolution, and model organism development. Attendees of the meeting work with a broad range of model systems, including echinoderms (e.g. sea urchins, sea stars, and sea cucumbers), hemichordates, ascidians, annelids, mollusks, and cnidarians. The science will span a variety of techniques, including genomics, imaging, high-throughput assays, cell biology, scRNAseq, gene editing, and much more. We will enjoy 3 days of plenary and concurrent sessions from invited speakers and selected abstracts, as well as two evening poster sessions. We will also include a session on broadening participation in science in groups historically not included in scientific education or research.