Devopsdays Stockholm 2020 will be held at 7A Posthuset on Vasagatan 28 in Stockholm.
The closest subway station is T-Centralen which is the subway station directly connected to the Central station and is also a commuter train station. The Arlanda Express will take you from Arlanda airport to the Central station in 18 minutes. The commuter train is cheaper but slower and will take you to T-Centralen in 39 minutes.
The venue is less than 5 minutes walk from the Central station or from T-Centralen.