Hi Blanche:
As teachers I think we have to look at all resources available to us. As for guest speakers, the recent grad is a great resource to tap in to because of their excitement, enthusiasm, fresh knowledge, and current job or career information.
Vendors are another source for guest speakers. They either can talk about products, or they are in touch with people who are active in your profession and are often willing to put you in contact with them. For vendors, after hours is not such a barrier as it might be for day classes.
Regards, Barry