I don't know...I think that a title like that might be somewhat limiting...people who want to write about more seasonal topics might not find it a good fit. And I think there are probably quite a few bloggers here who don't feel quite up to calling themselves writing mamas just yet, for whatever reason.
Naming it something broad and basic like "The Writing for the Web Fall Blogfest 2009" gives participants a lot more freedom in choosing their topics and how they'd like to structure their posts. Harvesting, fall traditions and back to school are possibilities. And anyone who wanted to do a day-in-the-life type post could still do one. Bloggers in the southern hemisphere can celebrate spring if they want to, which would provide an interesting contrast in the seasonal posts.
Let me know what you all think.