Comparing Fields In Tables

I am working with the article that MAK wrote on SecurityLogs http://www.databasejournal.com/features/mssql/article.php/3515886

I have completed this, but I have made some changes to the database (for normalization to 3NF purposes). I now have problems with a query.

I am trying to "Insert a new record in a table if it does not already exist in the table". To try to clarify I perform the following query:

INSERT INTO Tmp_Event
SELECT DISTINCT EventID, EventType, EventTypeName from Tmp

Which gives me the Tmp_Event table consisting of EventID's etc. (no duplicates). What I then want to do, is compare the 'Tmp_event' table and an already existing 'Event' table. These two tables are in fact identical. I would like to insert any records from 'Tmp_Event' into 'Event' if they do not already exist in 'Event'.

This query gives me all records that do not exist in 'Event'

SELECT EventID, EventType, EventTYpeName from Tmp_Event
WHERE EventID NOT IN (SELECT EventID from Event)

How can I change this query into performing an INSERT INTO Event as well?

Hope this makes sense :)

-Silia