Recent advances in observations have enabled unprecedented insight into magnetic reconnection and particle dynamics in Earth’s dayside cusp. This session focuses on dayside magnetic reconnection, its spatiotemporal variability, and the resulting changes in cusp plasma populations and electromagnetic signatures. We also encourage contributions that explore broader aspects of geospace coupling, including investigations of magnetospheric processes along extended orbital trajectories and connections between the cusp, boundary layers, and inner magnetosphere. Topics of interest include multiscale energy and momentum transfer, the role of solar wind drivers and IMF conditions in controlling cusp dynamics, and comparisons with global and kinetic models. Studies leveraging multi-instrument and multi-spacecraft conjunctions, including TRACERS, THEMIS, MMS, REAL, ARASE, EZIE, and other relevant space and ground-based observations, are strongly encouraged. This session aims to advance a comprehensive understanding of cusp electrodynamics, reconnection variability, and cross-scale coupling, while fostering collaboration across the geospace science community.