All those looking at grass roots series should maybe read this about the FNSS http://www.xcracer.com/viewblogpost.php?blog_id=219
It certainly looks like how to do it – spread the work between lots of clubs (presumably road clubs who also organise cross races in the winter) – thats why there are so many cross races to do.
One group organising a set of races is mental – ask the SMBC crew who do the Ratz Rampage series (4 short course races at same venue) AND the SouthernXC (5 full course races at different venues) – with course prep they are putting in about 20 days work each per year!
Cross is actually a fine way to get started in XC racing for the buzz of chasing people so why not lets all invade the cross races…