There's just three weeks left to check that your name is on the electoral register and to submit your details if they need to be updated.
The gathering will involve uniformed members of An Garda Síochána, Former Supreme Court Justice Catherine McGuinness and representatives of a number of political parties.
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It's organised by the Yes Equality campaign it's Political Director Tiernan Brady says it's vital every citizen has their say in the May 22nd poll.