Pauline:
You could try posting on the Civil War Reenactor's Forum, www.cwreenactors.com/forums/
Or, try to link to a unit through the MCWRA (Missouri Civil War Reenactors Association). You should be able to contact people in different units, close to home, possibly willing and able to give a presentation.
If not, email me and I can possibly put you in touch with someone in the St. Louis area.
Respectfully:
Skip Arensmann