Holiday Manager 
The only holidays that vBulletin Calendars contain by default are the built in holidays that you enable/disable in the Calendar Manager. We leave it up to the admin to add any holidays that they find important for their calendars. Since vBulletin is a global product, we could not possibly cover all cultural differences that apply to holidays.
Note:
Any holidays that you add through the Holiday Manager can be enabled/disabled per calendar in the Calendar Manager.

User Contributed Notes: Holiday Manager Add a Comment