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Ephesia (or Artemisia)

   (ta Ephesia). A great gathering of Ionians at Ephesus, the ancient capital of the Ionians in Asia. It was held every year, and had, like all panegyreis, a twofold character--that of a bond of political union among the Greeks of the Ionian race, and that of a common worship of the Ephesian Artemis. Thucydides compares it to the ancient Delia. Respecting the particulars of its celebration, we only know that it took place at night and was accompanied with much mirth and feasting, and that mystical sacrifices were offered to the Ephesian goddess. That games and contests formed likewise a chief part of the solemnities is clear from Hesychius, who calls the Ephesia an agon epiphanes. The drunken revelry described in the love-tale of Achilles Tatius is not mentioned by these authors.
    From the manner in which Thucydides and Strabo speak of the Ephesia, it seems that it was only a panegyris of a part of the Ionians, perhaps of those who lived in Ephesus itself and its vicinity.

This text is from: Harry Thurston Peck, Harpers Dictionary of Classical Antiquities. Cited Oct 2002 from The Perseus Project URL below, which contains interesting hyperlinks

Perseus: Harry Thurston Peck, Harpers Dictionary of Classical Antiquities (1898)
• http://www.perseus.tufts.edu/cgi-bin/ptext?doc=Per...
A Dictionary of Greek and Roman Antiquities (1890) (eds. William Smith, LLD, William Wayte, G. E. Marindin)
• http://www.perseus.tufts.edu/cgi-bin/ptext?doc=Per...