The PTA (or PTO -- whatever you have).
It is prime breeding ground for mutating
Cupcake Queens.
Also the "end of marking period" or "EOM" fricking parties: Yea us! (Well, all of us who don't die from the food party.)
The "healthy eating" stuff seems to also bring out the foodies. (Here! Let me cram milk down all of your throats -- even if it might mean anaphylaxis, doggonit!)
And be sure you've done the USDA form for meals, even if you have ZERO intention of having child eat cafeteria offerings.
There are the new "breakfast to go" meals (Fed program -- this is why serious form fill out needed so far as USDA and establishing LTFA with them as well) -- often eaten in first class (homeroom & 1st class) -- the kids do a grab-and-go. PBJ is on the menu. The principal has the option to alter and remove the PBJ from the offerings, as well as other foods that you might need DD to avoid so far as Xcontam and classroom.
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And yes to Science -- seems that since food is cheap and budgets are dwindling, there is lots of food use in demos and experiments.
MAKE them spell out the experiments ingredient-by-ingredient.
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FACS (whatever the family & food & nutrition & life and whatever your district calls it) -- find out what grading period DD will have the cooking section. You'll have to go in and work with teachers as to the supplies and recipes, utensils, and modifications/accommodations needed there. Be prepared that some of the ingredients may be stored and handled by cafeteria personnel.
Again, the USDA form will be part of your documentation.
You may need to visit the behind-the-scenes at cafeteria, even if child not eating their food.
REALLY look at how they store and handle the ingredients.
This was deal-breaker for us in lots of ways.