I don't know the planning cycle for these events, but with the numbers growing it is understandably difficult to find open dates for these things. 175 did have a Sunday event this past weekend. We passed on that one because of another conflict and chose to travel to Long Island for the 26th because our son DOES NOT have school the week of Thanksgiving.
Who knows how many of the other boys who registered also didn't have class on Tuesday?
If this statement had been public knowledge well before the event, and had they not held the event on about the same time a year ago I could almost understand the IMCLA policy, but with the announcement of the deal with Corrigan I smell something fishy.
And I agree if this is really about the kids then don't differentiate between DI and DIII, and also issues a broad ranging statement about any paid events, recruiting or otherwise which conflict with school. | 
