Dear June,
Perhaps this is the photo you are looking for...
http://archives.ubalt.edu/acgs/pdf/1911-12.pdf. Only a few of the persons are identified. It is the only photograph that is available on line as part of the American Clan Gregor Society's archives collection located at the Langsdale Library, University of Baltimore.
Here is a list of other photographs
http://langsdale.ubalt.edu/special-collections/a-z-holdings-list/american-clan-gregor-society/series11.cfmThe ACGS Collection Overview can be seen at
http://langsdale.ubalt.edu/special-collections/a-z-holdings-list/american-clan-gregor-society/ If you live close to Baltimore or are traveling in that direction, you may wish to make an appointment to see the collection. Library staff are very helpful to pull the items you may wish to see.