MySQL 5.6 - Creating an event inside a stored procedure
It seems there is a conflict in MySQL documentation.
I think CREATE EVENT Syntax section in MySQL documentation is not correctly updated in later versions. Although "CREATE EVENT Syntax" sections says


  You can create an event as part of a stored routine, but an event
  cannot be created by another event.


In Event Scheduler Restrictions section in mysql documentation, 
It says 


  An event may not be created, altered, or dropped by a stored routine,
  trigger, or another event. An event also may not create, alter, or
  drop stored routines or triggers. (Bug #16409, Bug #18896)