A search for circle on The Folk Club Map gets about twenty Singing Circle results in Ireland. Copy the link and paste it in to a browser; use landscape format. www.google.com/maps/d/u/0/viewer?mid=1Tf5UnYW2tZqJO6qcaMDdT3v-4D8JutUK There are probably other singing sessions there which don't use the word circle ;)
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sj