Professional Development (PD) Days are school days when teachers participate in training, planning, or administrative activities while students stay home. School boards schedule several PD days throughout the school year for curriculum implementation, professional learning, and administrative purposes. While education is provincial jurisdiction, PD days affect municipal communities as parents arrange childcare and recreation programs see increased demand. Municipal recreation departments often offer special programming on PD days to support working families. Understanding school calendars, including PD days, helps municipalities plan services meeting community needs when school routines are disrupted.