New answers tagged technique
An easier technique is to blow talcum powder on it. The moisture on the print will be visible as powder gets wet.
Film negatives are only light-sensitive while in the camera, until they are removed and processed. The processing includes a step to "fix" the image so that the negatives will not be further exposed by light. So once processed, film negatives (and slides) can be handled in daylight.
This reminds me of this question: What is a banquet photo?. There is no special technique needed here. Put the group up on the stage and arrange them as you would any other group of people. If the ages range significantly you may need to have chairs for elderly. 75 is a big group and you also have to consider if you want particular people near each ...
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