Monday September 6th is Labor Day so my guess is that there won't be
much of a turnout. I could make it on Thursday the 9th if that works
for others...
To get stronger attendance, I would suggest setting up a meetup group
as well. We've used it pretty effectively for planning London Ajax.
Twitter also works great for grabbing attention and promoting the
events obviously. Also, I might suggest something like
http://www.meetup.com/londonajax/calendar/14449749/ , e.g. an event on
a Saturday when people aren't rushing to make it from work. Plan it a
couple of months out so people can schedule around family events,
etc., get a few great speakers, and run it BarCamp style, etc.