In a promotional blog post, GitHub introduces "Octocat Wednesday," a fictional event offering a limited-time promotion of free private repositories. For one week, new users or those not already using private repositories can redeem a free month of GitHub's Micro plan, which includes five private repositories and one private collaborator. Users must log into their dashboard to check eligibility and redeem the offer, or sign up for a free account if they haven't already. The promotion encourages users to experience GitHub's private repository hosting, with the offer set to expire in a week.