
1) Ancient Roman festival 2) Festival of Poseidon
Found on
https://www.crosswordclues.com/clue/neptunalia

The Neptunalia was an obscure archaic two-day festival in honour of Neptune as god of waters, celebrated at Rome in the heat and drought of summer, probably July 23 (Varro, De lingua Latina vi.19). It was one of the dies comitiales, when committees of citizens could vote on civil or criminal matters. In the ancient calendar this day is marked as N...
Found on
http://en.wikipedia.org/wiki/Neptunalia

(from the article `Neptune`) Neptune`s festival (Neptunalia) took place in the heat of the summer (July 23), when water was scarcest; thus, its purpose was probably the ...
Found on
http://www.britannica.com/eb/a-z/n/26
No exact match found.