I used to be an employment specialist so I understand the difficulties they face. Your idea is a wonderful one, especially if it's in an area that has a high unemployment rate. When I worked for a county in CA they would allow individuals to offer regular workshops at their facility. So check with yours.

You might also try your local community centers. They are often very supportive of businesses like yours.

To take your idea a little further, you can also contract with other agencies and companies to use your clients for temp assignments. This will help them gain the experience, and build up their reliability and credibility, additionally, it would fill an employment need.

Hope some of this helps.