Are you American? I filled out the form and got this:
http://www.inis.gov.ie/en/INIS/Pages/non-visa-short-work'Exceptions & special circumstances
Work for 14 days or less
If your work starts and ends within a single 14 day period, you do not need to apply for immigration permission to work before you travel.
However, you must request temporary permission to work when you arrive at border control. Make sure to bring appropriate documents with you when you travel, eg original contract.
Work transfer from another EU/EEA country or Switzerland (Van der Elst)
You do not need to apply for immigration permission for work before you travel if you are employed by a company in another EU/EEA country or Switzerland and you are being sent to work in Ireland by your employer (up to a maximum of 12 months).
This status is called 'Van der Elst' (with reference to a 1994 European Court of Justice ruling).
However, you must request permission to enter Ireland for work when you arrive at border control. Make sure to bring appropriate documents with you when you travel, eg proof of employment, company address in Ireland.'
Do these apply to you?