The old Handbook 2: 21.1.22 (and probably Handbook 1: 17.1.24) had specific verbiage dealing with YSA conferences and approval required. But those sections have been changed in the on-line manuals. While nothing is said about YSA conferences, it indicates that approval can be done at the local level.
If you want to find the old verbiage, I'd suggest looking for a printed Handbook. I can't remember where approval had to come from. If it doesn't say anything specific, I'd suggest the Stake President ask the Area Authority for guidance.
Have you searched the
Help Center? Try doing a Google search and adding "site:churchofjesuschrist.org/help" to the search criteria.
So we can better help you, please edit your
Profile to include your general location.