It depends on where you live, but usually no. Most schools don't close just for Kwanzaa. They close for the holidays (ex. Christmas and New Year's) that are around Kwanzaa.
Back in the age of the dinosaurs, schools used to mail out a list of needed school supplies, and also provide local merchants with the requirements by grade level. Many merchants would pre-bag sets...
A trade school typically has instructors who are certified (if not also licensed) in the trades being taught (electrician, plumber, beautician, etc), or at the very least experienced in those trades...