Hi Michelle:
Tongue in cheek, I'd say "do a lot of planning!". Seriously, you might try to contact recent grauates who have contacts in their newly found profession; product vendors are willing to demonstrate their wares; ask your vendors or past guest speakers for leads (and introductions). You might even look within your own institution for others that have some related or similar experiences to come and speak. Sometimes it's just a different person talking with the students that piques their interest.
Regards, Barry