WebCalendar gives your WordPress site a clean, responsive calendar with the features you actually need — recurring events, iCal import, holiday imports, email reminders, and fine-grained permissions — without the complexity.

Calendar Views & Display

Month, week, and day views with smooth AJAX navigation — no page reloads
Responsive design that adapts to any theme and screen size
Color-coded categories for visual organization
Gutenberg blocks (Calendar + Upcoming Events) and [webcalendar] shortcode

Event Management

Recurring events — daily, weekly, monthly, and yearly patterns with RRULE support
Edit a single instance or the entire series
File attachments via the WordPress Media Library
Public, Private, and Confidential visibility levels
Conflict detection warns you about overlapping events (Starter+)

Import, Export & Sync

Import .ics files from Google Calendar, Outlook, Apple Calendar, or any iCal source
Export your calendar in iCalendar format
Import public holidays for any country
Subscribe to remote iCal feeds with automatic hourly sync (Starter+)

Collaboration & Permissions

Invite WordPress users to events with email notifications
Event reminders via WP-Cron
36 granular capabilities mapped to WordPress roles — control who can view, create, edit, and manage events
Multi-user calendar filtering and shared calendar views
Frontend event submissions with admin approval queue (Starter+)
Category merging for cleaning up duplicate categories (Business+)

SEO & Sharing

Single event pages with SEO-friendly permalinks
Schema.org Event JSON-LD, Open Graph, and Twitter Card meta tags
Social share buttons and “Add to Google/Outlook/Yahoo” one-click buttons

AI Integration

Built-in MCP server lets AI assistants (Claude, ChatGPT, etc.) manage your calendar — free on every edition
AI admin page with connection wizard, tools reference, and one-click testing
WordPress Abilities API integration for WP 6.9+

For Developers

Full REST API for events, categories, holidays, layers, and shared calendars
Built on Clean Architecture with webcalendar-core business logic library
PSR-4 autoloading, PHPStan Level 9, 1400+ automated tests
All calendar data in dedicated webcal_* tables — no Custom Post Types

Technical Note: Database Architecture

This plugin integrates webcalendar-core, a framework-agnostic Composer library that provides all calendar business logic (events, recurrence, iCal, permissions) through 17 repository classes. These repositories require PDO and use exclusively parameterized prepared statements — no raw SQL concatenation. WordPress-specific data (users, options, capabilities) is accessed via $wpdb through the plugin’s Bridge layer (WpUserRepository, WpConfigRepository, etc.). See src/Bridge/PdoFactory.php for the connection factory.

External Services

This plugin connects to the following third-party services:

Nager.Date API

Used for importing public holidays via WebCalendar > Holidays.
* Endpoint: https://date.nager.at/api/v3/
* Privacy Policy

Google Calendar Public Feeds

Alternative holiday source. Fetches public .ics files from Google.
* Endpoint: https://calendar.google.com/calendar/ical/
* Google Privacy Policy
* Google Terms of Service

Thunderbird Holiday Calendars

Alternative holiday source via community-maintained .ics files.
* Endpoint: https://www.thunderbird.net/media/caldata/
* Mozilla Privacy Policy

Freemius License Server

Used for license validation, automatic updates, and optional usage analytics.
* Endpoint: https://api.freemius.com/
* Privacy Policy
* Terms of Service
* Data transmitted: license key, site URL, plugin version, WordPress version

OpenStreetMap / Nominatim

When a single event page has a location and the map provider is set to OpenStreetMap
(the default), the plugin geocodes the address via the Nominatim API and displays a
map using OpenStreetMap tile servers. The event location string is sent as a search
query. No user personal data is transmitted.
* Geocoding endpoint: https://nominatim.openstreetmap.org/search
* Tile server: https://tile.openstreetmap.org/
* OpenStreetMap Terms of Use
* Nominatim Usage Policy
* OpenStreetMap Privacy Policy

Google Maps Embed API

When the map provider is set to Google Maps in settings, single event pages display
an embedded Google Map for the event location. The event location string and your
Google Maps API key are sent to Google. No other user data is transmitted.
* Endpoint: https://www.google.com/maps/embed/v1/place
* Google Maps Platform Terms of Service
* Google Privacy Policy

Add to Calendar Links

Single event pages include “Add to Calendar” buttons that generate links to Google
Calendar, Outlook.com, and Yahoo Calendar. When a visitor clicks a button, the event
title, date, time, location, and description are passed as URL parameters to the
chosen service. No data is sent until the visitor clicks.
* Google Calendar: https://www.google.com/calendar/render
* Outlook.com: https://outlook.live.com/calendar/0/action/compose
* Yahoo Calendar: https://calendar.yahoo.com/

Social Sharing Links

Single event pages include social sharing buttons for Facebook, X (Twitter), and
LinkedIn. When a visitor clicks a button, the event page URL and title are passed as
URL parameters to the chosen service. No data is sent until the visitor clicks.
* Facebook: https://www.facebook.com/sharer/sharer.php
* X (Twitter): https://x.com/intent/tweet
* LinkedIn: https://www.linkedin.com/sharing/share-offsite/

Development & Source Code

Full unminified source for this plugin is included in this distribution under GPL-2.0-or-later — you do not need to download anything external to rebuild the compiled assets.

What ships in this zip:

src/ — unminified React/JSX source for all admin components, frontend calendar, and the mini-calendar widget
build/ — the pre-compiled minified bundles (what the plugin actually loads at runtime)
package.json + package-lock.json — Node build manifest and lockfile for reproducible npm install
composer.json — PHP dependency manifest

Rebuilding the compiled assets from source:

Prerequisites: PHP 8.1 or higher with Composer 2, Node.js 20 or higher with npm 10.

composer install — install PHP dependencies
npm install — install JavaScript build dependencies (@wordpress/scripts, React, Toast UI Calendar, Leaflet, Tiptap)
npm run build — compile src/index.js and src/frontend.js into the minified bundles under build/

The compiled output in build/ is byte-reproducible from the matching src/ at the same version using this toolchain.