Saito Calendar Event builds calendars made of doors that unlock on a given date — an Advent calendar, a countdown before a launch, a “12 days of” campaign… Each door reveals its own reward on its day: a short title, a description, an image, a linked product and, with WooCommerce, a coupon code the visitor can copy or add to their cart in one click.

Fair by design

A door can only be opened on its exact unlock day: before, it is locked (with a countdown); after, it is closed for good. The date check is done server-side: the reward and the coupon code are never sent to the browser before the date.
Coupons are re-checked when added to the cart, and requests are rate-limited.

For visitors

Opening animation (a door that swings open), confetti in the colors of the theme, reveal modal with a “Copy” button and an “Add the discount to my cart” button (WooCommerce).
Opened doors show the photo of their reward; a progress bar counts the doors opened.
Keyboard accessible, respects “reduced motion” settings.

Seven designs

Christmas, Neutral and Editorial (flat colors, serif type, bento grid).
Sparkle (coral red and gold, fireworks, golden stars) and three Floral designs (blue and silver, white and gold, or both mixed): doors of varied sizes in a mosaic, with the 1st and 24th doors as large doors, an optional header showing the calendar title and a subtitle.
Colors, corner radius and borders can be adjusted, with a live preview.

For editors

A grid of doors in the admin: click a door to set its date, coupon, product (searched by name, with thumbnail, price and stock), texts and image. Drag a door onto another to swap their content.
Coupon helper: suggestions from your published WooCommerce coupons (discount, status, expiry), and a warning if a code does not exist, is used up, has expired or expires before the door’s date.
Scheduling: show the calendar only between two dates, with an optional “coming soon” and “it’s over” message.
All visitor texts can be customized; calendars can be exported/imported as JSON and duplicated from one year to the next.
Insert a calendar with the “Calendrier à cases” block or the [saito_calendar_event id="123"] shortcode.

Requirements

WooCommerce is optional: without it, doors reveal their text and image; coupons and linked products need WooCommerce.

The admin interface and default visitor texts are in French.

Third-party libraries and fonts

This plugin bundles the following open-source software, unmodified:

canvas-confetti 1.9.4 (MIT License) — https://github.com/catdad/canvas-confetti
vanilla-tilt.js 1.8.1 (MIT License) — https://github.com/micku7zu/vanilla-tilt.js
SortableJS 1.15.7 (MIT License) — https://github.com/SortableJS/Sortable
Bodoni Moda (SIL Open Font License 1.1) — https://github.com/indestructible-type/Bodoni
Great Vibes (SIL Open Font License 1.1) — https://github.com/googlefonts/great-vibes

The files in assets/js/vendor/ are the official, unmodified distribution builds of these projects (canvas-confetti in its readable build; SortableJS and vanilla-tilt.js as published, minified). Their full source code is available at the addresses above. The font license texts are included in assets/fonts/.