About Group Calendar 4
Group Calendar provides an in-game calendar for planning, signing up, and managing events. It can be configured for single-guild use or for multi-guild alliances.
The user's manual for Group Calendar 4 can be found at http://wobbleworks.com/groupcalendar/manual/.
I am continuing support for GC4 for guilds who have not migrated to the ingame calendar or GC5. GC4 offers those guilds features which are missing from the ingame calendar such as support for multi-guild alliances, the ability to "maybe" attend an event, the ability to specify your role when signing up for an event, and the ability to leave comments when signing up for an event. Eventually I will stop supporting GC4 of course, but I do plan on releasing an update for patch 3.3.
Patch 3.3 does add the "maybe" attendance response to the ingame calendar, so guilds may want to consider switching to the ingame calendar or GC5 once patch 3.3 is released.
Reporting Bugs
Feel free to report bugs in the comments section at the bottom of this page, but please don't paste in your bug/crash logs. Those logs are very large since they usually include the list of every addon you're running and that makes the post take a huge amount of screen space in the comments section. That, in turn, makes it very difficult for me to find previous questions and bug reports. Crash dumps are great and extremely useful, but please post them into a CurseForge ticket and then refer to that ticket in your comment so I know where to find it. Thanks!