Maine's Allagash brewery takes over the taps at Jack Rose on Leap Day, Feb. 29. (Photo courtesy of Jack Rose)

Today, as you're probably aware, is Leap Day. Every four years, the month of February receives an extra day, thanks to Julius Caesar. While the purpose of the day is to keep the solar calendar and the seasons better aligned, it's also an extra chance for restaurants, bars and other businesses to mark a "holiday" with a slew of specials.

If your birthday falls on Feb. 29, not only do you share a special day with Ja Rule, but several restaurants are trying to make your quadrennial celebration more affordable: Urbana, at the Palomar Hotel in Dupont, offers a full three-course dinner and glass of wine or cocktail to anyone who presents a valid photo ID with proof of their birthday. Downtown, Del Frisco's Grille is giving Leapsters a free order of cheesesteak eggrolls, while 14K, in the Hamilton Hotel at 14th and K streets NW, provides a free dessert and glass of wine with proof of birth date.

Of course, you don't have to be turning a year (or four) older to take advantage of Leap Day.

At Poste, anyone can order $2.29 frog's legs and pours of PBR beer for 29 cents per ounce.

Legal Sea Foods is offering a deal for couples at three area locations: two one-pound lobsters and two sides for $29. (The deal isn't valid at the National Airport location.)

And if there's a book you've been meaning to read, Upshur Books is offering 29 percent off everything in the store. (Upshur Street Books isn't usually open on Mondays, but is making an exception for the holiday.)

Some beer bars are taking advantage of the rarity of the holiday to tap rare beers:

The menu at Jack Rose's Allagash Leap Day Bash, which runs from 5 to 8 p.m., includes 2013 versions of the Maine brewery's Confluence, Fluxus and Interlude, and 2015 kegs of Curieux, Interlude and James Bean. All of the beers – including White, Saison and the new St. Klippenstein – cost $5. – you can probably guess what the focus of that site is – has organized a "Leap Beer" meetup at the Big Hunt featuring ales from Richmond's Strangeways Brewing. Strangeways isn't usually sold outside of Richmond, but the bar is taking advantage of D.C.'s famous grey laws to sell five different large-format bottles, including Only Brewed 4 Cuban Linx wild ale and the Snake and the Snowman, a strong Belgian ale. Prices will range from $20 to $30 for half-liter and 750-milliliter bottles, and the happy hour runs from 5 to 7:30.

RedRocks on H Street NE chose Leap Day to kick off its "Choose Your Brews" tasting event, featuring 20 beers from five Washington and Maryland breweries: Atlas, DC Brau, Right Proper, Denizens and Flying Dog. At the free event, which runs from 6 to 9 p.m., all pints are $6 and a flight of any four beers is $15.