Yes well the one person who could tell you has to be Wayne Francis whose web site
http://www.lightfoot.ca has a section containing full annual listings of every concert since 1974.
Each year's page is headed quite clearly "Tour Schedule"
Thus a google for "hartwood acres tour schedule lightfoot" should provide the date that you are looking for
but doesn't so perhaps you have the venue's name wrong
The nearest that google could find was
August 10 1995
a concert at the
I.C Light Amphitheatre in Pittsburgh see:-
http://www.lightfoot.ca/950810.htm
__________________
"Sir" John Fowles Bt
Honorary Curator Bootleg Museum
(where Sir does not signify that I am a fully benighted Knight just a Bt which signifies a humble Baronet -?? read the wiki!)
I meant no one no harm
Once inside we found a curious moonbeam
Doing dances on the floor