Religious holidays, cultural observances, and family-specific occasions such as reunions, graduations, and other special occasions tied to religion, culture, or a former spouse's family traditions when those matter to the child may not appear in a standard parenting plan. These situations can raise child custody issues if differing religious traditions were never addressed in the original agreement. The best approach is to include a catch-all provision that addresses how unlisted holidays will be handled, for example, by giving the requesting parent first right of refusal with 30 days' notice and clarifying whether the child will spend holidays from both parents' faith traditions over time. This prevents gaps in the schedule from becoming recurring points of conflict.