Numerically significant dates have become something of a phenomenon in the wedding world. Not only are they easy to remember for anniversaries, but many couples believe such patterns are lucky.  That's why fellow Vegas venues the Luxor and Excalibur are also peddling special "Lucky in Love" wedding packages this weekend, for $399 apiece. Caesars Palace is offering a chapel ceremony with two buffet lunches for $1,213.14, and MGM Grand Hotel & Casino touts a "Numerology Package" for $1,400 that includes limo service and custom wedding favors.  Paul said he began to notice an uptick in wedding demand a few years ago, on July 7th, 2007. Since then, his chapel has experienced jumps in business on dates like 1-3-13 and 11-12-13.  "It's a numbers thing," says Paul, clad in a black sequined jumpsuit and gold-rimmed aviators. "I mean we don't question it…as long as the check clears - next!"  Nevada's Clark County, where Las Vegas is located, has experienced a spike in marriage licenses heading into other "numerically significant dates," with the busiest block of time being July 4-7, 2007.  "This will be the last of these numerically interesting days for us, and so we expect the Marriage License Bureau will be very busy December 10th, 11th, 12th and 13th," said Clark County Clerk Diana Alba in a statement. The clerk's office is encouraging couples to pre-apply for licenses online, to cut down what's expected to belong wait times.  Read MoreBuffett can also pick 'em in Vegas  The phenomenon extends beyond the so-called "Marriage Capital of the World." XO Group's TheKnot.com says nationally, Saturday's lucky date is five times more popular than any other Saturday this month.  The wedding planning hub adds that, according to the 21,000 couples registered on its site for the 13th, the largest number of weddings will occur throughout the Florida, Texas and California.  Based on its own internal registry, David's Bridal says more than 11,000 brides walking down the aisle on Saturday. The privately-held wedding apparel retailer says that since one in three brides wears one of its dresses, over 33,000 couples are getting hitched.  That is nearly 8,000 more than the last sequential date, 11-12-13, which fell on a Tuesday. According to its "What's On Brides' Minds" survey, 43 percent of brides did or will claim "novelty" dates for their big day.  Small businesses are getting a boost too. In New York City, DJ company Scratch Weddings is reportedly experienced a 300 percent jump in requests for his services this Saturday compared to a year ago, according to the New York Post.  On the West Coast, Studio City, Calif.-based Gary's Tux Shop has rented out 20 more tuxedos this weekend than the prior one. It usually only sees this kind of business is during prom season, and the May to August summer wedding season.  To make the most of the 24-hour window, Graceland Wedding's Paul says he's starting ceremonies at midnight, officiating for two hours and then starting back up for breakfast. He'll then officiate four weddings each hour.  "This year we're busier because this is the last one," he said. "There is no next year, there's no 13-14-15. So this is kind of like the last of those number things if you want to look at it that way."  It almost gives new meaning to Elvis' famous song, "Now or Never."
Saturday is the last numerically sequential date in the calendar for nearly two decades, sending wedding demand soaring.