Well, the response so far is hardly a resounding vote of confidence. I suppose I don't need many people, but I do have a back-up plan.
If there's people who just want a game day rather than worrying about any of the new-fangled IRE nonsense, I'm content to set it up as a conventional three game narrative day; I can run any games I am GMing as IRE rules, but any other tables will be free to run with LRB rules.
If we do it that way, anyone who's wary of IRE can just avoid the games I'm running for the day.
(This is arguably easier for me, as it will let me focus on running one game rather than having to tutor several).