Tullamore for Gaza is holding the vigil this evening at 6pm.
The Global Sumud Flotilla says all of its vessels have been detained by Israel.
Its live tracker shows the last remaining boat, the Marinette, was marked as intercepted this morning.
16 Irish activists continue to be detained.
A vigil is being held in Offaly in support of the flotilla members and the people of Gaza.
Tullamore for Gaza is holding the 'Bridgil' demonstration at the Kilbeggan Bridge in the town at 6pm.
Organiser with the group, Fiona Dunkin says the least they can do is brave the elements this evening:
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