I know from the Soup for Teachers group that a couple of childcare groups are involved in the fight over the possible closure of up to 19 sites located at SPS sites. But I have also heard from many concern parents especially around how late they are hearing about this issue, for both themselves and their childcare provider (the former to find childcare and the latter to relocate.)
I also know that there has been some outreach to members of the City Council. Naturally, parents can reach out to whoever they feel might be able to help but the lines of governance and oversight are fairly clear here. The City has nothing to do with this issue except, of course, that they, too, want SPS space. Not exactly neutral parties.
My suggestions are to:
1) Go to one of this week's district meetings (see Seattle Schools This Week thread) and hand Dr. Nyland a letter with your concerns.
2) Find like-minded parents at your school and get as many signatures on any letter to Dr. Nyland or the Board as possible.
3) It's hard because no one knows for certain which schools are being targeted but reach out to other schools in your region and create a coalition to advocate. There is strength in numbers so use it.
4) Go to the directors' community meetings and ask how you can be part of any parent advisory board.
Anytime you write to anyone, be sure to cc Flip Herndon, Facilities, and the entire board, firstname.lastname@example.org.