<MiddleSchoolMom>
It sounds like the fundraising is being done in the school's name, the parents are just serving as volunteers. That shouldn't be a problem - people do it all the time.
Like any project, you'll want to have clearly defined expectations and goals and be definite about who's doing what.
Schools apply for grants all the time, so that's no problem EXCEPT you need to be sure your school and your district approve of the grant submission and agree to the use of any funds received. With grants there are often reporting responsibilities, sometimes even additional costs. (Example: One school got a grant to get some new computers; but the school district, who was not consulted, was not prepared for the expense of setting up a lab, wiring, software, maintenence, etc. They cracked down pretty hard on independent grant proposals after that.)
Would donations be deductable? Speaking strictly as mere mortal, not a professional tax advisor - my opinion would be yes - IF the donor's child does not directly benefit from the donation. For example, I send money to cover a field trip expense for my child - NO. But if I send $10 as an extra donation to the field trip fund, it should be deductable.
The tax publication on indvidual charitable donations is
www.irs.gov/pub/irs-pdf/p526.pdf.
It doesn't answer the question specifically, but a public school is a part of local government (to which contributions can be deducted) and there are a couple of examples that deal with school contributions. Example: I donate my car to a high school program on auto repair. How do I determine fair market value to claim my deduction?
Talk to your district officials. They get donatiions all the time and deal with this. They should know the appropriate response, what type of receipts to give, etc.
Good luck!