With thanks to Portee and Ganalane for kicking this thing off, I put all the pool dates I found into calendar order - better than wandering through them over and over:

April:
15 fdrake
16 Portee44
22 spiny
23 h_rattle
24 killick
24 lawnbowler
28 mzsmith
30 Headfirst

May
1 cedartree
7 beaver65
10 Rico
11 Sinbadsgold
13 Jayview
14 dmastercard
15 rdon
16 NN
16 Proto Baggins

June
15 woozlecat

I grabbed the best Portee list I could find as a source - if there's a better one, update this. I included mzsmith as he was on another planet at the time and according to his sidereal cosmic clock, he made the deadline. Here are the "predictions" already passed - with due respect for throwing their hat in the ring:

April:
6 prospect11
7 red911
8 SamMenard
8 Jokal
13 Ganalane