I have one wall calendar that I keep above my desk. I purchase it to support the Soft Coated Wheaten Terrier Club of America. I love the pictures. The only thing I use if for is the stickers to remind me when my dog's heartgard and frontline are due.
I keep a small calendar/address book in my handbag and that is where I record appointments. I'd be lost without it.
However, it seems that all the people that used to send you address labels (and they are still doing that) are also sending calendars. Big, beautiful calendars. I think if I get one more I'm going to scream! I have no place to put them. I have given away no less than a dozen gorgeous calendars. These are coming from charitable organizations. Some I support, some I would like to, they all want my money.