I want to be able to link a specific to a calendar event, so I can get directly back to the email from the calendar event. Possible?

I just tried dragging and dropping an email to Calendar and was pleasantly surprised that it created an appointment on the calendar and in the notes added a nifty "Show in Mail" link. You can even drag a Contact into Calendar to create a new appointment for that person as the recipient of an invite. You can also add document attachments. You can also drag an email into a Notes note and it provides a similar link to the actual email.