This working is a function of density. First, imagining a park at the corner is a huge assumption.
Second, if the park isn't within shouting distance of the necessary number of kids, half of the ones within shouting distance are at parent-scheduled activities, and half of the remainder aren't allowed to brave street crossings because of the six-foot-tall hoods and inattentive drivers of passing ChildMurker1050s, no amount of park yelling will be sufficient.
Second, if the park isn't within shouting distance of the necessary number of kids, half of the ones within shouting distance are at parent-scheduled activities, and half of the remainder aren't allowed to brave street crossings because of the six-foot-tall hoods and inattentive drivers of passing ChildMurker1050s, no amount of park yelling will be sufficient.