Participants have until 11:59 pm PT on June 26 to enter the GitHub Learning Lab Explorer Challenge and earn a unique badge for their Community Forum profile, showcasing their commitment to GitHub learning. This exclusive badge is only attainable through this challenge. To participate, users must log into lab.github.com, complete at least three courses, and submit their entries on the challenge page in the Community Forum. Those who have already completed the necessary courses simply need to finalize their submissions to be eligible.