The Acropolis might not be able to open late due to health & safety restrictions, but the nearby Acropolis Museum is not only open until midnight (free admission after 9pm), but also has a free concert in the courtyard outside the building.

From:
Acropolis Museum

August Full Moon
Wednesday, 21 August, 2013

The Acropolis Museum celebrates August Full Moon on Wednesday 21 August 2013, with famous melodies of the Greek and world repertoire, performed by the historic Army Band of Athens, in the Museum’s entrance courtyard at 9:30 p.m.
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Many Greek archaeological sites are open late because of the full moon on August 21st. Unfortunately, the Acropolis will close at 8pm, due to health & safety concerns. This has been the case since 2011 and there don’t seem to be any plans to revert to the previous late opening that it enjoyed.

From:
Capital.gr

Friday, 16 August 2013 – 11:47
Greece celebrates night of the full moon on August 21

The night of the full moon on August 21 will be celebrated with free events and open access to major sites, museums and monuments throughout Greece, with open-air performances of music, theatre and even guided tours offered by the culture and sports ministry.

In an announcement, Culture Minister Panos Panagiotopoulos publicly thanked the staff involved in ensuring that the “Under the Light of the Moon” programme is a success, such as archaeologists, museum curators or guards at sites and museums, as well as local authorities for their support.
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Unfortunately, unlike other years, due to issues with large numbers of visitors in previous years, the Acropolis will not have a late night full moon opening this August. Many other Archaeological sites in Greece will be open late however.

From:
Kathimerini (English Edition)

Wednesday August 3, 2011
Acropolis closed for full moon night

Officials said on Wednesday that the Acropolis, the most popular ancient monument in the Greek capital, will not open on the night of the August full moon following extensive damage to the site last year.

Fool moon night in August is the only time when archeological sites remain open after sunset.
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Despite some earlier worries that it would be called off due to strikes, the planned August full moon late night opening of Archaeological sites in Greece is going ahead this evening (Tuesday 24th August).

This event has happened for a number of years now, with great success.

From:
Athens News Agency

08/24/2010
Archaeological sites open for August full moon

(ANA-MPA) — More than 90 archaeological sites around the country will remain open on Tuesday during the evening hours on the occasion of August’s full moon, the last of the summer.

The New Acropolis Museum, the Acropolis itself, the Cape Sounion site and the National Archaeological Museum in downtown Athens will remain open to the public, a more-or-less summer tradition over the past few years that was, nevertheless, threatened with cancellation this year to a disagreement between the relevant culture ministry and staff at the archaeological sites over extra pay.
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Greece is continuing the tradition of previous years, with a late night opening of the Acropolis site in Athens (along with numerous other sites) to coincide with the full moon.

From:
Athens News Agency

08/06/2009
August Full Moon events

The August full moon has always been a special event in Greece, as it is the time when the moon is so close as to give the impression that one only has to reach out to touch it.

In recent years, the Culture Ministry has established a tradition of opening up a large number of the countries archaeological sites, monuments and museums throughout the country on the night of the August Full Moon.
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As in previous years, the Acropolis site will be open late during summer full moon evenings.

From:
Athens News Agency

16/08/08
August Full Moon

The Culture Ministry will open 72 archaeological sites, monuments and museums all over the country on Saturday night, the night of the August Full Moon.

The development is taking place as part of efforts to familiarise the public with archaeological sites and with the country’s cultural heritage in general.
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