Isn't the idea to translate the Irish to English? Why isn't the translation "Festival of November"?
Samhain in Irish means November. Hallowe'en is the e'en/eve of November, Oíche Shamhna, or of All Hallows (Lá na Naomh Uile) the Eve Oíche na Naomh Uile?
My favorite holiday
If Nollaig requires 'An' to become 'Christmas', does Samhain require 'An' to become 'The Festival of Samhain'?