Welcome to the Calender, to log into your specific calender you have to go to the WoWArmory Site. To Login you will get your character pane, and on it a tab that says Calender. That will pull up an active Calender for your character. I am linking the login to the Calender here for member's ease in reaching it. Note: You have to login to the Calender (Blizzard Site) With your WoW Password and Information. Hence why we cannot direct link to the guild calender.

WOW ARMORY BLIZZARD CALENDER LOGIN-HERE