A Limerick anti-water charges group were told not to show up for today's parade in the city because the event "does not have any place for political agendas."
The group, "we won't pay," had previously been told they were entry number 41 in the paradem and said they had received their pass and documentation last week.
They received an email yesterday saying they could not take part.
We Won't Pay campaigner and organiser of the campaign's entry Amanda Keane said the children are very disappointed.
"Our float in the parade was a lively, colourful thing that involved children who were all excited to be taking part.
"We had costumes made and everything ready - it was just a disappointment," she said.
However, she said the group would still be in Limerick city with their float, even if they were not part of the official parade.