They must WEAR a pfd
In public schools, no. In private schools, it is likely but not always a requirement.
According to U.S. Coast Guard regulations, on a motorboat that is 23 feet long or less, all individuals on board are required to wear a U.S. Coast Guard-approved personal flotation device (PFD) when the vessel is underway. This requirement applies to all passengers, regardless of age. Additionally, children under the age of 13 must wear a PFD at all times while on the boat, unless they are below deck or in an enclosed cabin.
It protects public deposits.
Children 12 years old and under must wear an approved personal floatation device at all times while on board.
If by "proprietary company" you are referring to a non-public, non-stock issuing. privately owned business, - - there is no legal requirement that such a company hold public meetings.
public policy
No formal annoncement is required.
children or the disinterested public
For use on the public roads/areas YES that is a legal requirement.
No formal annoncement is required.
Some public houses allow children in the bars but some dont.
Requirement for a lawyer aspiring for moor membership.