I would like to play concert in one or two Helsingin libraries (e.g. Töölö or Pasila). How to organize that? Whom to contact?

Contact information of the libraries can be found here:

Pasila library Libraries and opening hours | helmet.fi

Töölö library Libraries and opening hours | helmet.fi

You can send an e-mail to the library and tell what kind of event you have in mind and ask questions concerning the possible event. You can also call to the chief librarian, he/she can refer you to the person who is responsible of the events in the library in question.