Migrating from Modern Events Calendar: Key Database Quirks Developers Must Know

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Modern Events Calendar Lite was permanently removed from WordPress.org on May 11, 2022, for a guideline violation, though many sites continue running it via the developer's own distribution. Each event is stored as a custom post type called 'mec-events', with scheduling data held in post meta fields rather than the plugin's derived database tables. Developers migrating away from the plugin face several data pitfalls, including weekly repeat intervals stored in days instead of weeks, occurrence counts saved as one less than the user-entered value, and ISO-formatted weekday numbers that differ from PHP and JavaScript conventions. Advanced monthly repeat rules are stored as compact tokens such as 'Sun.1' or 'Fri.l', while location or organizer ID 1 is a placeholder meaning 'hide it' and should not be imported as a real venue. Auditing raw post meta with direct database queries is recommended before attempting any migration to avoid silently incorrect dates or repeat schedules.

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