Special events are often tied to particular times of the year, but sometimes the reasoning behind the pairing can leave people in full-on head-scratching mode.

There is no mystery, though, why National Burger Month, which is May, and National Burger Day, which falls on Thursday, May 28, are when they are: The backyard grills are rolling out in profusion this time of year, and the long Memorial Day Weekend sees its share of outdoor, patty-laden parties.

If you've been celebrating Burger Month all along, well, we raise our ketchup bottle to you. But if you still haven't gotten your condiment-cool noshing in, mark May 28 down on your burger-tracking calendar and make for...