We're having a meet down at Deal this weekend, so the topic of UK participation will be raised. Already, you can count on three at least, plus likely support from our Irish contingent and local guests.
27 holes per day at Carne is comfortable, though you'll know you've been on a hike. The club do a 27-hole green fee rate, which as an online booking for a fourball is currently €80 each. That is the rack rate, which is very reasonable in itself. The Enniscrone rack rate is €55 and Mulranny €20.
Tony's itinerary suggestion cuts down on the frenetic driving between venues that the hardy souls who did Holland experienced. Once you get there, the car keys will be used sparingly and there'll be plenty of time to relax between rounds.
The date (either June or September) will depend upon the likelihood of full participation. The first weekend in September should be the target, to make the best of available daylight, though if this clashes with the school holidays (and this is an issue) then the weekend after.