Hi Rob,
How exciting that you are coming the east coast for the tournament!
I spotted a few campsites and motorhomes parks around Drogheda such as
Cove View Holiday Park,
Moore's Caravan Park and
Mc Donaghs Caravan Park.
However, these aren't featured on the
Camping Ireland website and therefore, there's little information about their services and whether they provide electricity for guests travelling by motorhome. I'd suggest you contact them directly (I hyperlinked the phone numbers and contact pages I found).
Have you got planned to go anywhere else after attending the tournament? You may be interested in exploring
the Boyne Valley.
Talk soon,
Antoine