Classic Calendar (Revived) — A Full-Featured Calendar for WoW Classic Era

The official Blizzard calendar was never ported to Classic Era — Classic Calendar fills that gap. It brings the full-featured calendar UI you know from Wrath and Retail into Classic Era, with accurate holiday schedules, guild event management, world buff scheduling, and a P2P sync system that keeps your whole guild in sync automatically.

The Problem

Classic Era has no built-in calendar. There's no way to see when holidays start, plan raid schedules, share world buff drop times with your guild, or get reminded when an event is coming up. Officers end up juggling spreadsheets, Discord pins, and manual whispers to coordinate anything beyond the current raid night.

World buff scheduling is especially painful — drop windows are time-sensitive, anyone in the raid needs to know when to be online and buffed, and without a shared system, drop times get posted in officer chat and immediately lost in the scroll.

The Solution

Classic Calendar re-implements the Blizzard calendar for Classic Era. It shows the same monthly grid you're used to, populates it automatically with holiday events and battleground weekends, and lets players and officers create events visible to the whole guild. An integrated world buff scheduler with a delta-sync P2P system keeps buff drop times shared across every guild member running the addon — automatically, with 96% less traffic than a broadcast approach.

Core Features

Calendar UI

Full monthly calendar grid matching the Wrath/Retail calendar interface
Navigate months forward and backward; click any day to see its events
Holiday banner art displayed across the full duration of multi-day events
Flashing calendar button when you have pending event invitations
Access via the minimap button, calendar button, /cal, or /calendar
Draggable minimap button — unlock and reposition it anywhere

Holidays & Automatic Events

All Classic Era holidays with accurate 2026 dates: Lunar Festival, Love is in the Air, Noblegarden, Children's Week, Midsummer Fire Festival, Harvest Festival, Hallow's End, Winter's Veil, and more
Darkmoon Faire schedule with location (Elwynn / Mulgore) shown on the calendar
Battleground Weekends with the active Call to Arms battleground shown per week
Stranglethorn Fishing Extravaganza (Sundays 2–4 PM)
Per-holiday banner art toggles — enable or disable each holiday's banner art individually in Options
Season of Discovery: Fireworks Spectacular banner support

Event Management

Player events — create events visible to every invited player
Guild events — create events visible to your entire guild automatically
Copy/paste events from one day to another
Mass-invite all attendees of an event directly to your party or raid
In-game mail notification when an event you're attending is cancelled
Event reminders — configurable notification (raid warning, alarm sound, or button flash) before events begin

Calendar Filters

Toggle visibility of holidays, battleground weekends, world buffs, and player/guild events independently
Filter controls accessible from the calendar toolbar

World Buff Scheduling

Track upcoming world buff drops (Onyxia, Nefarian, Hakkar, Rend, and more) on the guild calendar
Officers create world buff drop events; guild members see them automatically
Placeholder buff entries keep the schedule visible even before a drop is confirmed
World buff event window saves its last position
Event title keyword recognition: Dropping, Head, Heart, Rend, Onyxia, Nefarian, Hakkar

World Buff Sync (Delta-Sync P2P)

Automatically shares world buff data between all guild members running Classic Calendar
Hash-based comparison on login — data is only transferred when a mismatch is detected (96% less traffic than broadcast)
Session management limits concurrent syncs (3 inbound / 3 outbound) to prevent resource exhaustion
Self-healing mesh via periodic heartbeat — all guild members reach eventual consistency automatically
Strong table isolation prevents data from bleeding between buff types (Onyxia, Nefarian, Hakkar, Rend)
Per-character SavedVariables prevent data corruption between alts
Manual sync via /calwbsync to trigger a full guild sync on demand
Guild Leader is the authoritative source of truth — prevents non-GM characters from overwriting correct data

Officer & Guild Settings

Officer Settings tab — restrict guild event creation to officers only (rank 2 and above)
When restricted, non-officers will not see the "Create Guild Event" option in the calendar context menu
General tab shows live guild settings status: valid hash, event creation permission (All Members / Officers Only / Unknown)
Officers can broadcast updated guild settings to all guild members
Guild settings sync via the P2P addon message system — no visible chat spam
Debug mode accessible to officers via /caldebug

Options Panel

General tab: starting weekday, calendar button visibility, event alarm configuration, debug mode
Art tab: individual toggles for each holiday's banner art (Battleground Weekends, Children's Week, Darkmoon Faire, Fishing Extravaganza, Hallow's End, Harvest Festival, Love is in the Air, Lunar Festival, Midsummer Fire Festival, Noblegarden, Winter's Veil)
Officer Settings tab: guild event creation restriction, guild settings broadcast
Right-click the minimap or calendar button to open the Options panel directly

Localization

Holiday names and descriptions localized for: enUS, deDE, esES, esMX, frFR, itIT, koKR, ptBR, ruRU, zhCN, zhTW
Options UI falls back to English for any untranslated string — no blank labels

How It Works

Calendar Engine

On load — holiday data is generated for the current year and populated into the calendar grid
Day click — the selected day's events are listed; click an event to see details or RSVP
Event creation — right-click any day cell to open the event creation dialog; choose player or guild visibility
Reminder system — a background timer checks upcoming events and fires the configured notification type before each one starts

World Buff Sync System

On login — broadcasts a hash of local world buff data to the guild via addon messages
Mismatch detected — if another guild member's hash differs, a delta exchange is initiated
Delta applied — only added, modified, and removed entries are transferred and merged
Heartbeat — periodic background broadcasts ensure latecomers receive the latest data without a full re-sync

Slash Commands

/cal or /calendar — open the calendar
/caloptions or /calendaroptions — open the options panel
/calwbsync — manually trigger a world buff data sync with guild members
/caldebug — toggle debug output (persists across /reload)
/ch — CalendarHelper commands (guild event creation, world buff scheduling)

Requirements

WoW version: Classic Era (11508)
Guild membership required for guild events, world buff scheduling, and sync features
Officer rank (2 or above) required for officer-only features

Known Issues

Guild event invites are broken as a result of Classic patch 1.15.3 — leaving this as-is in case Blizzard fixes it
Holiday dates and times are best-guess where no authoritative source exists — please report inaccuracies in the comments
Battleground Weekends are hidden for Season of Discovery due to inconsistent and overlapping scheduling
Characters not in a guild may not see created/updated events until after relogging
No way to disable in-game mail notifications for cancelled events — this is controlled by the game, not the addon
Pressing Escape closes the entire calendar instead of one panel at a time — uses functionality not available in Classic Era
Guild Announcements and Community events are unavailable — only present in later WoW versions

Recent Updates

v1.5.2 (2026-05-03)

New option in General settings: "Hide the calendar minimap button" — hides the minimap icon while keeping the calendar accessible via /cal or /calendar

v1.5.1 (2026-04-13)

Fixed: The delete event confirmation popup no longer covers half the screen — it's now a compact, properly-sized dialog

v1.5.0 (2026-04-13)

New: The invite list right-click menu now shows RSVP options (Confirmed, Standby) directly — no more blank flyout arrow
RSVP via right-click is restricted to event creators and moderators; other attendees use the existing RSVP buttons at the top
Fixed: Invite list sort buttons (by #, Rank, Level) now toggle correctly between ascending and descending — no more unexpected resets
Fixed: Status column header now lines up with all other column headers

v1.4.4 (2026-04-10)

Fixed: Art checkbox labels were blank for all non-English game clients — all labels now display correctly regardless of language

v1.4.3 (2026-04-04)

Fixed: Stray debug messages that could appear in chat have been removed

Credits

Toxiix & LoveDiodes — original authors of Classic Calendar; designed and built the calendar port, holiday engine, and CalendarHelper integration that the addon is built on.

Pimptasty — revival, ongoing maintenance, World Buff scheduling system, delta-sync P2P rewrite, officer settings, guild sync architecture, and new feature development.

Community

Bug reports, feature requests are welcome, reach out on Discord.

Classic Calendar - Revived