The Defense Advanced Research Projects Agency (DARPA) is hosting a Proposers Day webcast for its Mechanisms for Amplification of Fusion Reaction Rates in Solids (MARRS) program, aimed at informing potential proposers about an upcoming Broad Agency Announcement (BAA). The MARRS program seeks to enhance the understanding of mechanisms that can significantly increase nuclear fusion reaction rates in solids at or near room temperature, with a focus on experimental demonstrations. This initiative is critical for advancing research in nuclear fusion, which has significant implications for energy production and national defense. Interested parties can contact the BAA Coordinator at MARRS@darpa.mil for more information, and the Proposers Day is scheduled for January 20, 2026, with the BAA anticipated to be released in late December 2025.