An integrated Events Calendar and Roster solution for gamers.
Interactive features including signups by character, attendance Yes No Maybe, recurring events, comments and more!
Here is an example of how ShivTR accomplishes this: (Guildies sign up by character name. Raid host can post an image of the raid which shows on the monthly calendar view as well. And as long as guildies update their correct time zone, the Calendar automatically displays the time each guildie needs to be at the event, aka it respects all time zones)
In order for this to work, I believe that this needs to come packaged with a roster addon which allows guild members to add their characters so they can sign up to raids with them.