Matthew McCullough from GitHub is attending the JavaZone conference in Oslo and is hosting an open invitation GitHub drink-up event. The gathering is set to take place at Cafe Con Bar, located at Brugata 11, at 8:30 PM on Sunday, September 11th, coinciding with the sold-out Git workshop at the conference. Attendees will have the opportunity to discuss Git and GitHub while enjoying drinks, making it a social extension of the conference.