@raymondjohnson NCTM said they wanted to make the submission date the same each year for consistency. I agree that this year feels a bit off, but perhaps that's because this year's conference is a bit later than usual (end of Sept?), perhaps because of the Jewish holidays that vary from year to year.
So I guess it would be great if the deadline were then a bit later, but I guess given the volume of submissions and the number of volunteers they have on the conference committee, they must need enough lead time to notify people by the following spring so they have enough time to plan. I wonder what the lead time is for other large conferences. #MathEd #MTBoS