It only happens once.  07/07/07.  July 7th, 2007.  Everyone from Vegas to Florida is buzzing about the 'lucky' date.  Seminole Hard Rock Hotel and Casino are planning the following specials on that date:

More than $177,000 in cash and prize giveaways.

House wine, Buffalo wings, hot dogs: each 77 cents

Lucky 7 burger: $7.77

Sports memorabilia on display from players who wore the number 7, including the Yankees' Mickey Mantle and the Broncos' John Elway.

A justice of the peace will be on hand to officiate a wedding for all those dying to tie the knot. (If you want it to be legal, have your paperwork in order.) Couples who want to renew vows can join in, too.
The mass ceremony will take place at 7:07 p.m.