This is the weirdest bit about this thread. Your children aren't allowed any bought food, no restaurants, no kids parties, no takeaway, nothing?
We eat out a lot (restaurants, cafes, coffee shops) and occasionally have takeaway. Commercial kitchens are inspected by environmental health and given hygiene ratings. Staff are trained in safe food handling. I know it doesn't eliminate the risk of food poisoning but it reduces it significantly. Very different to a stranger's kitchen, where food could be out of date, left out of fridge all day, contaminated by pets, dirty utensils etc.
Just doesn't seem worth the risk.
I wouldn't buy food from an unregulated market stall, baked goods from unlicensed kitchen, anything homemade from a fete. Happy to eat food made by close friends and family.
Interesting to get different POVs.
A child's birthday party isn't a community event. You're inviting people to celebrate your child's special day. To me that means feeding your guests, the same way you would at a wedding, bar mitzvah, naming ceremony. 'Breaking bread' means eating together, not everyone chipping in to supply the food!