
1) Ancient Greek religion 2) Festival in ancient Greece
Found on
https://www.crosswordclues.com/clue/orgia

Latin, meaning: a festival of mysteries, orgy
Found on
http://archives.nd.edu/ooo.htm

In ancient Greek religion, an orgion (ὄργιον, more commonly in the plural orgia) was an ecstatic form of worship characteristic of some mystery cults. The orgion is in particular a cult ceremony of Dionysos (or Zagreus), celebrated widely in Arcadia, featuring `unrestrained` masked dances by torchlight and animal sacrifice by means of ran.....
Found on
http://en.wikipedia.org/wiki/Orgia
No exact match found.