Software If you’ve ever tried to run a busy calendar on WordPress, you’ve probably hit the wall. Most calendar plugins store every event as a WordPress post, and somewhere past a few hundred events the admin slows to a crawl — with the front end not far behind. For a small events page that’s fine. For a real calendar — a booking system, a large organization, years of history — it’s a dealbreaker.
That’s exactly the problem WebCalendar for WordPress was built to solve. Instead of custom post types, it uses purpose-built database tables — the same schema behind the WebCalendar project I’ve maintained for over 20 years — so it stays fast whether you have 50 events or 100,000.
How fast? I put together a live demo that renders 5,500 events — one for every git commit in WebCalendar’s history — right inside a WordPress page. It loads and navigates without breaking a sweat. In production the plugin has been run with 105,000+ events, multiple users, and remote calendar subscriptions, with no performance issues.
Speed isn’t the whole story, either. It’s the only free WordPress calendar with full RFC 5545 recurring-event support, and it ships with month/week/day views, iCal and CSV import/export, holidays for 100+ countries, multiuser permissions, a 35-endpoint REST API, and even a built-in MCP server so AI assistants can manage your calendar. It’s about 5 MB (some competitors are 60+), backed by 1,000+ automated tests and PHPStan Level 9 static analysis.
WebCalendar for WordPress is free and open source on WordPress.org. Try the live 5,500-event demo, then grab it at agenticdaisy.com/webcalendar.
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