There are two key strategies that you can use, for publicizing an educational seminar.
The first key strategy that you can use for publicizing an educational seminar would be that in which you advertise it aggressively. The objective here would be to reach the targeted audience as a whole, rather than attempting to reach the targeted audience on a ‘one on one’ basis.
The second key strategy that you can use for publicizing an educational seminar would be that in which you communicate with the targeted attendees directly, and on a ‘one on one’ basis, and inform them about the upcoming seminar. This is something you can do using the phone. It is also something you can do via email. If, for instance, you are a Gmail (www.gmail.com) user, you just need to login to Gmail, and then shoot off emails to the targeted attendees of the educational seminar, informing them about the seminar, what the seminar will be all about, when it will be held, where it will be held, who the speakers will be… and so on. This should push them to attend, as they will get the feeling that your effort in contacting them personally can only be done justice by them attending the seminar — if they can find the time.