PLaw,
Although our schools are NOT closed for any Jewish Holidays, we do have 3 Jewish teachers, one of whom takes the day off (excused absence) for all of these holidays (don't know if others are not practicing Jews, or just don't take the time off).
As far as the students go, in CA the only excused absences are Dr. App'ts, Illness and Court appearances. However, any religious holiday and/or service (i.e. Ash Wednesday), we are required to "excuse" the absence. I've never really had any problems with anyone taking off for religious purposes, and have never heard any comments one way or another from any staff/parent or student.
BTW, thaks for the invite to the Mass. Commune. Haven't heard that word in a while. Is this like a "flower power", "make love not war" type commune. :p

I'll dig out my bell bottoms and love beads.
TIS