The database for the holidays for the calendar are not something that SMF set up.     They are part of the software.    Although I did like the ability to add and remove them too if having that causes problems and makes that database huge I think living without it is a good idea.

Forum Url: http://http://wildrose.smfforfree2.smfforfree.com
My calender has disappeared. Can someone tell me what the problem could be? I tried to add an anniversary last night, it was added, and the calender was fine. But when I got up this morning...No calendar?
It is gone from the main index page...I can still go to the admin section, but there are little in the way of options there.
Thanks in advance.
   
http://wildrose.smfforfree2.com/index.php

I'm not sure what you mean by "icon"  ?

Do you mean it is not at the bottom in the info center?
It will only show there if there are dates on your calendar that are in the range you set in settings.
In other words if you set Max days in advance on board index to 7 and there is a holiday 9 days from now it wont show up down there for 2 more days.   Also doublecheck the dropdown menus right under that option.     
Calendar Guide