http://www.njzinefest.8m.com (as of right now the website has not been updated.)
This is the info I've seen for the Boston Zine Fair:
> Boston Zine Fair 2007
> March 24th & 25th
> Pozen Center, MassArt
> Boston, MA
March 24th is also the date for the Denver Zine Fest.
The Richmond Zine Fest will be held Saturday, April 28th, 2007.
If I find out anything else I'll post it, now that there are actual people in this community. :)