jerseydad- I looked up all those above and couldn't find any info on them. They are usually posted around December or January, I believe.
In the past, the PG National is the 3rd weekend in June and I have heard it is being held in Cincinnati next year. The other three are usually ran in the very beginning of August. I would think the organizations would try to schedule each showcase so they don't interfere with each other. Last year it was the ECP in the first few days of August, then the Area Code games right after for a few days and then the Aflac game directly after that.