What are the types of information that attendees will need for a meeting?

Venue, date and time of the meeting. Indications on how to get to the venue if this is not part of the everyday environment of the attendees.

Purpose of the meeting, and individual assignments, especially for the attendees who may have to participate directly. Advance documentation for any people in this situation.

Accomodation details when the proposed meeting has a span of more than a day, meal details if provided by the company or possibilities to eat at a nearby site / restaurant when the meeting will last more than half a day.

Practical information regarding the venue, restroom location for example. List of the people attending, and dress code if any.

Statement of the desired level of knowledge, or achievements at the end of the meeting for both attendee and company.