
1) Festival of Apollo 2) Non-Gregorian May observance
Found on
https://www.crosswordclues.com/clue/thargelia

Thargelia (Greek Θαργήλια) was one of the chief Athenian festivals in honour of the Delian Apollo and Artemis, held on their birthdays, the 6th and 7th of the month Thargelion (about May 6 and May 7). Essentially an agricultural festival, the Thargelia included a purifying and expiatory ceremony. While the people offered the first-fruits o...
Found on
http://en.wikipedia.org/wiki/Thargelia
[moth] Thargelia is a genus of moths of the Noctuidae family. ...
Found on
http://en.wikipedia.org/wiki/Thargelia_(moth)

in Greek religion, one of the chief festivals of Apollo at Athens, celebrated on the sixth and seventh days of Thargelion (May-June). Basically a ... [1 related articles]
Found on
http://www.britannica.com/eb/a-z/t/33
No exact match found.