From mundocani comes the GroupCalendar v3.1. From the name itself, this will allow groups of friends to share an in-game event calendar wherein they can post events for dungeons they need to do quests for. Once installed GroupCalendar replaces the minimap current time tooltip and sun & moon icon. This can be used to open the UI or it can be opened using the /calendar command.

v3.1 Changes
- Added event types for Burning Crusade dungeons and PvP
- Tab key now works correctly in the class limits dialog
- Shaman and Paladin classes are now shown for both factions
- The Whisper button in the Add Player dialog now works under patch 2.0
- Users making attendance changes will be reminded that they should wait before logging off
- Updated French translation
- Auto-config data is written correctly when the guild information panel is too full