Is it legal to book a Town Hall (eg. Newbridge Townhall in Kildare) for the purpose of staging a political protest/assembly?

So recently, it emerged that members of the Filipino community in Ireland have used Newbridge Townhall in Kildare for their political assembly/protest for the release of former Philippine President Rodrigo Duterte from ICC detention. They have disguised the political assembly/protest as an 80th Birthday Bash for Duterte perhaps to take advantage of any loopholes in the laws of foreign countries regarding political assemblies or protests.

That being said, is it actually legal in Ireland to book a Town Hall (such as Newbridge Townhall) for the purpose of hosting a political assembly/protest for a politician who isn't even an Irish politician? (and to clarify, this is a politician lawfully arrested for crimes against humanity whose supporters believe that he's been kidnapped by the ICC)

Also, if the person booking the assembly lies to the Town Hall administration about how they're just booking the Hall for a "birthday party" and it is found that they actually used it for a political assembly, can they be held criminally liable for it?

(Context behind asking this question: In Qatar, there were Filipinos who did this very same "protest" for Duterte and got arrested because they were found to have staged these protests without proper authorization so I figured asking here if pulling the same stunt (that is, holding a protest/political assembly disguised as a birthday bash for a foreign politician in a place that is not privately-owned) would be punishable under Irish laws)

(Context 2: A context that's much closer to Ireland (in terms of it happening within the EU, which Ireland is also a part of) would be the fact that Europe-based Duterte supporters pulled the stunt of lying to Dutch authorities about organizing a picnic in front of the ICC detention facility to celebrate Duterte's birthday, and after they got a permit issued for this, they showed up with a full blown protest and Dutch police weren't very happy about it.)