The Defense Advanced Research Projects Agency (DARPA) is seeking information on innovative approaches and technologies for the thermal packaging of cryogenic microsystems, specifically within the temperature range of 10 mK to 77 K. The objective is to identify advanced materials and strategies that can enhance the performance and energy efficiency of computing systems in cryogenic environments, addressing challenges related to thermal insulation, heat transmission, and interconnects. This initiative is crucial for advancing high-performance computing capabilities, and DARPA will host an in-person workshop on December 2, 2024, at Booz Allen Hamilton in McLean, VA, to discuss the state-of-the-art in this field. Interested parties must register for the workshop by November 18, 2024, and can direct inquiries to the BAA Coordinator at DARPA-SN-24-106@darpa.mil.