Hello Clare,
Thanks for the question!
I would like to suggest that you have a look at the Irish Revenue website, in particular the
Temporary Admission page, which relates to goods for display or use at exhibitions and fairs. There are also contact details for the
Authorisations and Reliefs section that may be able to help in the area of these being gifts or giveaway items at the fair. Such items may fall under the
Goods permanently imported for exhibitions, fairs, or meetings category, but they will be best placed to explain the rules.
I hope the event goes well! ☺️