Kulturnatten has been an annual event in the city for 26 years and is on the Friday at the start of the Autumn break for schools.
More than 250 museums, theatres, libraries, churches, government ministries, city institutions, including the city hall and the court houses, and parks open for the evening with special events, displays, lectures and tours to show what they do and why.
There is street food and often drinks and food in the venues themselves. Entrance is free with the culture pass - this year just 95 kroner for adults - and with that pass all public transport around the city is free.
With so many events and spread around the city - from Frederiksberg and through the historic centre and down to Amager - its sensible to look at the programme and plan a route around what you want to see. Nearly everything starts at 6pm and runs through to at least 10pm with many continuing on to midnight or later. It is a huge and popular evening for families and this really is Copenhagen at its best and most open and most friendly.