Hacktoberfest is an annual Open Source hackathon challenge that takes place in October, designed to facilitate collaboration and growth of the community. It encourages participation through creating pull requests, hosting local events, and donating resources to projects. The event is open to anyone with a GitHub or GitLab account, regardless of skill level, and offers opportunities for professional growth, such as meeting experts, collaborating on large-scale projects, and learning new techniques. Sauce Labs is participating in Hacktoberfest by providing a list of Open Source projects to contribute to, hosting events, including Twitch streams and an in-person event in Berlin, aimed at supporting newcomers and experienced contributors alike.