As in other years, the New Acropolis Museum is going to have free admission & various special events to celebrate International Museums Day on May 18th.

From:
Kathimerini (English Edition)

Friday May 17, 2013
Celebrating International Museum Day around Greece

Museums around the country celebrate their past, present and future this weekend as a number of local cultural institutions take part in festivities marking this year’s International Museum Day.

The International Council of Museums (ICOM) established International Museum Day back in 1977 in an effort to raise public awareness with regard to the key role played by cultural organizations in societies. The annual celebration usually takes place around May 18.
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As happened in April for International Monuments Day, the New Acropolis Museum will have free admission on 18th May 2012, to celebrate International Museums Day.

You can read more about International Museums Day here.