GitHub HQ in San Francisco celebrated the 5th anniversary of Hacktoberfest on October 1, 2018, with an evening event featuring food, drinks, and opportunities for learning and networking. The event included a workshop on contributing to open source, along with demos and lightning talks from notable speakers like Gatsby creator Kyle Mathews, Electron engineer @codebytere, and Apollo GraphQL engineer Michael Watson. Attendees were encouraged to register via Eventbrite, and those unable to attend were invited to find or organize similar events globally, with Hacktoberfest activities occurring in various cities worldwide.