Not quite what you were looking for, but The Museum of the New South in
Charlotte, NC has an exhibit that contains items from cotton to a race car
driver's uniform, including information from the 40's and 50's about
segregation and the KKK.  They have a basket on the wall that contains
post-its and pencils for writing comments about the exhibits.  There were
post-its everywhere, with comments ranging from a child's "I think cotton
is cool" to some very profound and sad and angry thoughts about segregation
and racism.  (Quite frankly the notes were even more interesting than the
exhibit.)  Even with such a charged subject matter, no one seemed to have
anything particularly ugly to say.  Whether that's because the staff
polices the comments or because people are sometimes suprisingly genteel I
don't know, but it was all very civilized.  Anyway, if there's anything you
can take from that and use. . .Anytime you can get a visitor more involved
you make their visit more meaningful.
Katherine Steiner Stocker
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"If the world were a logical place, men would ride side-saddle."  --Rita
Mae Brown