About disabling Calendar (or just the ability to add event) for Users

[Mahmut TEKER]

Hi,

   I am not sure asked before but I could not find information to 
disable calendar for users. In my system LDAP logs people in as default 
user and it is ok for me but this default user can create event at in 
the calendar and they can even send invitation to this event. As a 
result I want only Moderators and Admins could create event and invite 
to the system. How can I do this? Thank you very much,


  Best Regards,


_Mahmut