I thought there was a line in this song about the feast of St. John , Féile Naomh Eóin (in June), but what I see here is a line about St. Brigid's Day (in Feb)

An té a bhéas thoir Lá Fhéil' Bríde, is é a chífeas an spóirt
Ag comharsana go síodúil ag ól fiona 's beoir;
Beidh na deochanna dhá líónadh
Is na gloiníocha 'goil timpeall
'S an té nár gineadh i mbroinn, beidh cuimhne aige ar an ól.

(whoever is east on the feast of St. Brigid, will see great sport and drinking)

and elsewhere I see a line about the bellowing of cows and calves at the coming of the feast of the virgin Mary (a cattle market at a fair? or just the cattle in the fields?) "Tá géimneach bó is lao ann le teacht do fhéile Muire Mór." https://songsinirish.com/condae-mhaigh-eo-lyrics/

I wonder what Irish song has the line about lá fhéile Eóin or if it is in this song but not in the verses submitted to the discussion.

and here is a recording in Irish, by Na Filí https://www.youtube.com/watch?v=3JrSqEekMEY