If you are looking for a way to promote a big event, you should consider postcard printing.  Postcards are a great way to send a message to many people very quickly.  While emails can be disregarded as junk mail, a postcard received in the mail is likely to at least be looked at.  You should make your postcards visually appealing using a combination of colors and fonts.  You can also include an image on the postcard that would be interesting to your targeted audience.  Make sure to send out your postcards far enough in advance.

You will want people to know about your event before they make other plans!  The more postcards you send out, the more attendees you will get.  Luckily, there are professional printing companies that offer great prices on postcard printing and can even send out the postcards for you.