The most common time to sing fun songs is after meals in dining halls. Kitanniwa also had daily morning sing periods of about 45 minutes for girls 10-13 years old where songs were taught and sung by request.
What did your camp do?
Picture is from Kitanniwa, probably in the 1930s when it still was located at Clear Lake. Copy made from one owned by Battle Creek, Michigan’s Willard Library.