Additionally, there is even a City Library branch within the National Technical Library building in Technicka Street n. 6. As opposed to virtually all other libraries, the Opencard library counter in Dejvice is open on Mondays.
City Library Prague is closed every Monday with just two exceptions: A small branch in Hradčany and the above mentioned library in Dejvice situated in the new building of the National Technical Library.
The Contact Point in Dejvice library offers standard Opencard services, such as the option to submit the application form or collect your card. Obviously you can also activate your library card on the spot.
You can also register your Opencard as a library card for the National Technical Library. The procedure is described here.