Ouch! - that's savagely expensive for the Shelbourne, and I couldn't find an LNF for this hotel (where I have LNF'ed on 4-5 previous occasions for friends as I live very close by) - usually I pay approxe 50% of that rate or less.

What is on in the city over those dates? I noticed that the Merrion (a very nice LHW hotel close by which I was going to recommend instead) is also full on these nights.

Feel free to contact me by PM if you need feedback on your visit to DUB, but I've had no look finding you an LNF I'm afraid.