Rain forecast isn't looking too good... but just in case it doesn't, below is the area I was thinking of meeting at.

What do you guys think about meeting at the IBM atrium in the case of rain? Looks like it has a bunch of tables. It is across the street from the Sony atrium at 590 Madison.

I'll bring name tags, and a sign with a pic of a mustache to put at the table.
Probably a good idea to bring lunch for yourself since we're meeting at noon.
I'm gonna bring watermelon as a snack to share.