According to McGuire, the first Monday in September is an ideal date for such a public celebration due to optimum weather and the date's location on the calendar, sitting midway between the Fourth of July and Thanksgiving public holidays.
Labor Day picnics and other public gatherings featured speeches by prominent labor leaders on a regular basis.
The Sunday preceding Labor Day was designated as "Labor Sunday" by the American Federation of Labor convention in 1909, to be dedicated to the spiritual and educational aspects of the labor movement.
Although some churches continue to recognize it, this secondary date has not gained much traction in popular culture.
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The Seattle longitudinal study of cognitive development discovered that among older people (d.) higher socioeconomic status is associated with higher levels of intellectual functioning. Interacting socially and economically is a great factor in keeping up your intelligence up to date.
I also think it is the first one, but I am not entirely sure.