NAPLE Sister Libraries Day (NSLD) was first celebrated in 13 September 2013.

The NAPLE sister libraries participating designed  one or more special postcards with the slogan Reading is Fashionable . Then, printed them and attached them to balloons that were released. Postcards included these messages in a combination of English and the local language of each library.

Postcards and Activities at NAPLE Sister Libraries:

• Municipal Public Library in Piekary Slaskie (Poland)
• Municipal Library Český Těšín (Czech Republic)
• Kaunas County Public Library (Lithuania)
• Arucas Municipal Library  (Spain)
• Korčula City Library “Ivan Vidali” (Croatia)
• Povilas Višinskis Šiauliai County Public Library  (Lithuania)
• Daruvar Public Library (Croatia)
• Ljubljana City Library (Slovenia)
• More from Ljubljana City Library (Slovenia)
• Sant Joan de Vilatorrada Library “Cal Gallifa” (Spain)
• Ermua Municipal Library (Spain)
• Public Library “Viktor Car Emin”  Opatija (Croatia)
• Lousada Municipal Library (Portugal)
• City Library “Slavko Kolar”  Čazma (Croatia)
• Public Library “Antonio Rendic Ivanovic” Sutivan (Croatia)
• Ptuj Public Library (Slovenia)
• Huesca Municipal Libraries (Spain)
• Public Library “Fran Galovic” Koprivnica (Croatia)
• Valença Municipal Library (Portugal)

Reports and pictures of the celebration:

• Ermua Municipal Library (Spain)
• Arucas Municipal Library (Spain)
• Korčula City Library “Ivan Vidali” (Croatia)
• Municipal Public Library in Piekary Slaskie (Poland) 
• Municipal Library Český Těšín (Czech Republic)

NAPLE Sister Libraries Day around the Internet:

• El Correo: La biblioteca conmemora hoy el “NAPLE Sister Libraries Day” (about Ermua Municipal Library’s participation)
• IKorkula: NAPLE Sister Libraries Day (about Korčula City Library “Ivan Vidali”’s participation)
• Korkula: Čitanje je u modi! (about Korčula City Library “Ivan Vidali”’s participation)
• City Library “Slavko Kolar”  Čazma  website: Prigodni poštanski žig – 50 0bljetnica smrti Slavka Kolara; NAPLE Sister Libraries Day
• Ermua City Council: Las bibliotecas europeas soltarán globos en la iniciativa ‘Sister Libraries Day’
• Gran Canaria, Isla de Lecturas: Día Internacional de las Bibliotecas hermanadas en la Biblioteca de Arucas
• Kulttuurikirjastonhoitaja seikkailee (Kaisa’s blog, librarian at Sastamala Public Library, Finland) : Happy NAPLE Sisters Libraries Day!
• Povilas Višinskis Šiauliai County Public Library  website: „NAPLE Sister Libraries“ diena
• Portal da  Rede de Conhecimento das Bibliotecas Públicas: 13 de setembro – Dia das Sister Libraries do NAPLE  

The Postcards

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Reading is Fashionable  slogan in the languages of the participating libraries:

• Basque: Irakurtzea modan dago!
• Catalan: Llegir està de moda!
• Croatian: Čitanje je u modi!
• Czech: Čtení je módní!
• Finnish: Lukeminen on muodikasta!
• Lithuanian: Skaityti madinga!
• Polish: Czytanie jest modne!
• Portuguese: Ler está na moda!
• Slovene: Branje je v modi!
• Spanish: ¡Leer está de moda!