This calendar is owned by the files@neonmakersguild.org google account. If you need access to add events to the calendar on behalf of the guild, your email needs to be added to the "Settings and Sharing -> Shared with" settings for the "Neon Makers Guild" Google Calendar. If you just wish to have your event posted, please post your event in the forums The Lounge and the person responsible for updating the calendar will add it.