The Southern California Symplectothon is an annual intensive learning multiday retreat for Southern California geometers which will take place in fall 2025 and fall 2026, with the upcoming workshop slated to take place at the University of Southern California Wrigley Marine Science Center in Avalon, CA. Participants will meet over a long weekend to learn about and disseminate important new developments in geometry and topology, with a special focus on symplectic geometry and adjacent areas. The Symplectothon will also make a concentrated effort to build the local regional network, by forging and strengthening in-person bonds and potential collaborations. Each Symplectothon workshop will focus on a specific emerging topic, and participants will typically consist of 20-30 graduate students, postdocs, junior faculty, and senior faculty from an array of institutions in the greater Southern California region. There will be one or two in-person invited experts and a similar number of virtual invited experts. Participants will stay together in a single dedicated location, and talks will be given by the participants, with plenary lectures by the invited experts. Each Symplectothon will also include several guided discussion and Q+A sessions, as well as a forward-looking talk on future directions by one of the invited experts. Outside of the intensive scientific programming schedule, participants will have ample time for open discussions, while building personal and professional ties