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.
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.
According to AMNA, in Attica, however, the Athens Acropolis and Sounion sites will not be open after 8:00 p.m. for safety reasons, due to risks of injury to visitors due to works being carried out on the sites. In Sounion, visitors will have free access to the hill adjacent to the Temple of Poseidon, which has a view of the temple.
There will also be free access to Filopappou Hill in Athens, opposite the Acropolis, where the Athens Municipality΄s Philharmonic Orchestra will hold a concert beginning at 9:30 p.m. entitled “On Filopappou my love is hidden somewhere”.
Visitors can visit the temporary exhibition “The Antikythera Wreck – The ship, the treasures, the mechanism” at the National Archaeological Museum free of charge (from 8:00-11:00 p.m.) and there will be a night of music with musicians Lina Nikolakopoulou and Argyro Kaparou in the garden of the Numismatic Museum of Athens at 9:00 p.m., sponsored by the Museum Catering Company SA.
Visits to the archaeological site at Amfiareio will be accompanied by recordings of orchestral music and the singers Vasilis Lekkas and Melina Kana will be performing at the archaeological site in Elefsina.
There is also a symbolic attempt to ΄bridge΄ the islands of the southern Aegean through a recital on the islands of Andros, Paros, Antiparos, Milos, Amorgos, Sifnos, Ios, Kea, Kimolos, Santorini, Syros, Ikaria and Samos of Federico Garcia Lorca΄s poem “Lament for Ignacio Sanchez Mejias” as delivered by Andy Garcia in the 1996 film ΄Marcos Zurinaga Muerte en Granada΄ and by Greek actor Manos Katrakis in the 1971 Greek translation by Nikos Gatsos, from a play by Stavros Xarhakos, and by Notis Pergialis in the 1950s from a Greek translation of the poem by Stathis Spiliotopoulos.
In addition to the events listed above, each region of the country will be hosting events at key sites, especially of music, video shows but also guided tours.