A crowd gathered at an ice skating park in the winter.
A crowd is at a place for skating.
A single person walks alone down the road.
Usually local resources like special ad hoc efforts and innovations are needed for these activities.
Not all studies of a small number of instances are case studies, however.
The Imperial Palace is always closed to the public no matter what day of the year it is.
A baby is crying
Two people are sitting on a dock.
A boy is riding a bike down stairs.