Worked on the qmk/RIOT repository to enhance the reliability and maintainability of the event system, focusing on both code robustness and documentation clarity. Developed targeted robustness tests in C to verify that event_timeout_is_pending behaves correctly when event_timeout_t is not fully initialized, addressing edge-case initialization paths in embedded systems. Updated documentation within the codebase to align terminology from xtimer to ztimer, ensuring consistency and reducing potential confusion for future contributors. Emphasized thorough testing and clear documentation practices, leveraging skills in C programming, embedded systems, and technical writing to deliver features that improve both the functionality and maintainability of the project.