Send meeting requests but don’t request responses

I’m organizing an open event and want to send a lot of people a notification of this event. I’d like to send out an appointment so they can add it easily to their Calendar but I really don’t need to receive a notification in whether or not they will come. How can I achieve this?

You can indeed send them a Meeting Request with all the information that you want to share. To disable the request for responses;

Outlook 2007 and Outlook 2010
On the Meeting tab, in the Attendees section click the Responses button. Here disable the options "Requests Responses" and "Allow New Time Proposals"

Outlook 2003 and previous
Click Actions and disable the option "Request Responses".
By default "Allow New Time Proposals" is disabled but it is good to verify that this option is indeed disabled.

Meeting responds options
Disabling the request for responses.

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