My managers are all keen on sending meeting invitations.
I found an annoyance with the mail program Evolution is the invitation may be sent a day or so ago bu then will refer to the time of the meeting to be "Tomorrow".
This can be confusing since I keep thinking it is today because the email was sent yesterday. i can add it to the calender i suppose and then look at the calendar entry but i think the date should be clear.

I searched through the preferences and although there is a date format that can be adjusted there doesn't (I think) have something that will stop the tomorrow entry.

How can I get rid of "tomorrow" and just get the date instead?

Perhaps you could post a marked up screen shot explaining this problem clearly.

I'm assuming that this is not someone using the text "tomorrow" in their invitation and it is the time posting of the event.

Yes, you probably should add it to your calendar and review how it stores it there.