When the schedule so dictates, barring inclement weather, or any such event that would preclude play.
Further to that, there are certain factors that prohibit the scheduling of a night game, due to broadcast rights and city ordinances. For example, on Sunday evening, ESPN has exclusive broadcast rights, so all other games must be day games. Also in Chicago's Wrigleyville neighborhood, a city ordinance prohibits night games on Friday and Saturday, excepting a nationally televised game.
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