NDC organizes different conferences annually in the United States, Australia, and Europe. Since its inception, NDC Conferences has been delivering high-end conferences for software developers for over 20 years. Their events range from huge 5-day conferences with over 2000 participants to smaller niche events and workshops. Their headquarters can be located in Oslo, Norway and they have branches in Australia, Denmark, Portugal, the UK, and the United States.
Most of their workshops and courses can be delivered and tailored as in-house training.
To give you an idea, NDC Conferences are currently running in London (since 2013), Oslo (since 2008), Sydney (Since August 2016). They also had a mini NDC Conference in Copenhagen last February 2017.