OK, this PTA creatively calls it the "Kindergarten Cry"
but I still love the name "Boo Hoo Breakfast" for an event to welcome/support the new parents at your school, who are letting go of their babies for the first time. Fun way to make that first connection and make a great first impression.
Reminds me -- there a whole bunch of good "Boo Hoo Breakfast" docs in our File Exchange. Have you seen the File Exchange yet? It's my favorite new PTO tool of 2008 (though I am a bit biased).