Hello again. I found an interesting article on-line in pdf format:Brigit the Holy Woman by Séamus Ó Catháin of the Dept of Folklore at University College Dublin.
You may think this an odd timne of year to bring up Lá Fhéile Bhríde, but Ó Catháin (quoting Máire Mac Neill) discusses links with the summer festival of Lughnasa (or Lúnasa)