I didn't respond at first to the pastels thread because I thought it was an April Fool's joke. I've been to IRD in 3 states and I had never heard of it.
I agree, I thought that IRD was supposed to be the 3rd Saturday in April. Unfortunately, in recent years, my chapter has had Family Day, allowing for a small timeframe for IRD. That's why I was glad that they finally separated the 2. Hopefully, they will do the same next year and put IRD on the 3rd Sat. so that alumnae will always remember to block that day.
One reason for the different days this time is because of the 100th anniversary. Celebrations are happening that probably haven't happened before and "most" AGDs can't be in 2 places at one time.