World of Warcraft Group Calendar

Group Calendar allows guilds or groups of friends to share an in-game event calendar. The guild can post raid events and members can post events for dungeons they need to do quests for. Additionally, players can provide feedback to the event sponsor saying that they will or wont be attending an event. Once installed Group Calendar 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.

Some features:
Added Maybe status, which is distinct from Standby (see compatibility issue note below).
Event owners can preview their event as well as sign up their own alts and specify their own role
Added right-click support to minimap button for accessing the new Blizzard Time Manager feature
Added Russian translation (thanks to Eritnull)
Updated Spanish translation (thanks to Maqjav)
Default limit for off-tank and off-healer roles is zero (may eventually remove these roles completely)
Attendance notices now include the date of the event
/cal attend on|off command added to disable attendance notices
Default attendance view for manual and closed events is By Role