List updated with Fran's likely candidates. The all-caps parts don't mean anything except that their NAMUS entry had all caps when I copied and pasted. I didn't copy over the moon data yet. The starred names are the identified victims.
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07/30/06...NY...Michelle Lyn Hutchings, age 27
http://www.charleyproject.org/cases/h/hutchings_michelle.html May have been seen in the New Jersey area in 2007.
09/10/06...NJ...Jessica L. Paolini, age 22
http://www.nampn.org/cases/paolini_jessica_l.html, known to frequent the same Camden area several other women have disappeared from.
09/18/06...NY...Jessica Isabel Rodriguez, age 27
http://www.nampn.org/cases/rodriguez_jessica_isabel.html From Florida, disappeared from Schenectady (which is probably about three hours' bus ride from Grand Central Station).
*Maureen Barnes.....last seen Monday, 7-9-07
This is the Monday after the 4th of July, which was on a Wednesday that year. Lots of people took Wednesday through Sunday as a very long holiday weekend. Maureen is still listed in NAMUS.
Brittany Peart, from Maryland, officially last seen 7/25/08 but probably seen after this date heading north.
http://www.nampn.org/cases/peart_brittany.html
Judy Rivers, Fairfield area, Saturday August 30, 2008. She is believed to be a runaway. Per the Norwalk Police Department, Judy is a ward of the State of New York who was placed in Connecticut. She left with a boyfriend and has not been seen or heard from since.
Maria Claros, Hartford, Hartford, Friday July 03, 2009, MARIA'S LAST C0NTACT WAS BY CELL PH0NE WHEN SHE T0LD M0THER SHE WAS IN NEW YORK.
*Melissa Barthelemy.....Last seen, Sunday, 7-12-09
Fourth of July was the weekend before, with many people getting the holiday on July 6. So this might have been the first available weekend.
Leslie Colon, New Haven, Monday July 13, 2009, very little data
****** odd that three women disappear on the same weekend
Shannon Gilbert.......last seen, Saturday, May 1, 2010
This is quite early in the year relative to the others, and on a different day. The circumstances don't seem to necessarily fit, either.
Angelica Cruz, New Haven, Saturday September 04, 2009 - 03:00 Angelica may be traveling in the company of an adult male. She may travel out of state.
*Megan Waterman.......last seen, Sunday, 6-6-10
An ordinary weekend.
Elena Jazmir Lozada, Missing, Tuesday, 7-6-10
This is the Tuesday after the 4th of July weekend, which was a three-day weekend with Monday the holiday.
https://www.findthemissing.org/cases/8308/0/
*Amber Costello......last seen, Tuesday, 9-7-10
This is the day after Labor Day, which was rather late last year.