Hey there :)
As per question:-
☆ informing other employees of a specific meeting time and place, without the owner's permission is likely to cause a problem or misunderstanding.
This is because the owner or biss wont be able to know the timing and informations which were given only to other workers. This would eventually make the boss feel that the hist worker isnt giving any respect or priority to the boss.
So, it will cause a chaos, maybe leading to his dismissal.
~ Benjemin360