It's a monthly session. Following details taken from their Facebook page :

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Free, fun Song Sessions
3rd Saturday every month;
9pm, Strand Hotel (seafront), Bray, Co. Wicklow.
ANY style of song / acoustic self-accompaniment.
No standard set. Only rule is respect for the singer.
All singers & listeners very welcome.
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Regards

p.s. I haven't managed to get there yet, despite promises but, knowing George and his cohorts, I still look forward to the prospect!