Hacktoberfest 2023 offers developers an opportunity to contribute to open-source projects, with Nylas inviting contributions to their code samples as part of the event. Participants can engage with Nylas by building communication features using their API and sharing their work through pull requests, following guidelines to ensure meaningful contributions. Developers are encouraged to explore the Nylas documentation, blog, and YouTube channel for resources and support, with the Nylas team offering guidance and feedback throughout the event. The initiative not only enhances participants' coding skills but also fosters a collaborative community around Nylas' tools and services.