From the Montreal Celtic Society's website:
Celtic MTL 2015 is a convention to promote and educate the population about the Celtic Nations. Here in Montreal we have a habit of defining Celtic to be an Irish term. However the Celts also include the Cornish (Cornwall, UK), the Manx (Isle of Man, UK), the Breton's (Brittany, France), the Welsh (Wales, UK), the Scottish (Scotland), and the Galicians (Galicia, Spain).
This convention will have numerous Celtic societies and organizations who will be present to showcase their heritage, and introduce themselves to people who are interested in learning more about their Celtic background or even Celtic culture in general. Furthermore, this show will also comprise of artists, musicians, guest speakers, and performances by locals and visitors from outside of Montreal. This event will have the Celtic spirit in many different varieties!
The St. Patrick's Society is pleased to support this event.
Further information can be found here