Publish calendar events to all users without invitation

Hello,
I was wondering how i can publish a calendar event on all user mailboxes without the acknowledgements of invitations.
i.e. i want one person in our organisation to publish and maintain all mandatory holidays.
I can not find a suitable way to do this as all of the users will get invitations wich they can ignore or forget. I want this person to publish events while overruling the possibilty of accepting invitations.
We are running Windows Server 2008R2 with Exchange Server 2010.

Hi,
We can create all holiday events in a calendar and export the calendar to a PST file. Then using New-MailboxImportRequest cmdlet in Exchange 2010 to import the calendar to all users mailboxes by administrator.
To import the calendar to all mailboxes, we can run:
Get-mailbox | New-MailboxImportRequest –FilePath \\Exch1\pst\HolidayCalendar.pst -IncludeFolders “#Calendar#”
Here are two articles about the detailed information:
Holiday Calendar and How Import to Mailboxes
http://blogs.technet.com/b/manjubn/archive/2012/01/14/holiday-calendar-and-how-import-to-mailboxes.aspx
Import Calendar Events into all Mailboxes in Exchange Server
http://slipstick.com/exchange/cmdlets/import-calendar-events-mailboxes-exchange-server/
Thanks,
Winnie Liang
TechNet Community Support

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Publish calendar events to all users without invitation

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