The forerunner of Yn Chruinnaght was founded in 1924, and was known as Cruinnaght Vanninagh Ashoonagh ("Manx national gathering").
The "great National Poet" referred to is Thomas Edward Brown (1830–1897) whose poems, including lengthy verse-stories in Manx dialect (of English, though with some Gaelic words), were published by Macmillan.
The Cruinnaght Vanninagh Ashoonagh was organised by William Cubbon through the WMA's Ellan Vannin magazine, which he edited.
Mona Douglas's programme note in 1979 states that "It was decided to stage Yn Chruinnaght in Ramsey, the only town in the Island which had no important festival of its own, and which, like Peel, was a recognized centre of the national revival."
Whereas Cruinnaght Vanninagh Ashoonagh had been a festival only of Manx culture, Mona Douglas conceived Yn Chruinnaght in its modern form as an inter-Celtic festival, giving an opportunity for the six Celtic nations of the Isle of Man, Brittany, Ireland, Scotland, Wales and Cornwall to participate.
Mona Douglas was particularly pleased to receive official recognition for Yn Chruinnaght from Oireachtas na Gaeilge in Ireland, Gorsedd y Beirdd and Yr Eisteddfod Genedlaethol in Wales and Am Mòd in Scotland.