Free and cheap in NYC: Chocolate, Chipotle and more, Oct. 28-Nov. 1

In honor of National Chocolate Day on Wednesday, Oct. 28,Aureolepastry chef Pierre Poulin will make his signatureNYE Ball Drop dessert— a dark chocolate sphere filled with manjari chocolate mousse, crunchy praline bits and dark chocolate — then give away 200 of them to the audience. Beginning at 6 p.m., head to Anita’s Way, the public art space breezeway next to the Charlie Palmer-owned restaurant, to get your Times Square-inspired dessert.

The Doughnut Projectquietly opened in the West Village two weeks ago, and its small-batch doughnuts in off-the-wall flavors — pineapple-habanero, the Maple Bacon Bar, above, and an option tochoose your own glaze and toppingson their standard yeast doughnut — are already attracting a line out the door at 10 Morton On Thursday, Oct. 29, help them make their opening official by stopping in for a free doughnut between noon and 4 p.m. (They’re normally $3.75-$4.25.)

Haven Spa and Eve Salon is moving to more spacious digs at 250 Mercer St., and if you get there by Nov. 9, you can score a blowout at their new blow dry bar for just $25 (usually $45). The new location allowed the salon to install some lavish upgrades, including couples massage rooms, express treatments, men’s services and huge steam rooms.

On Halloween night beginning at 5 p.m. until close,Chipotleis holding its annual Boorito fundraiser. All locations will be selling burritos, salads, bowls and tacos for just $3 if you arrive in costume, with one catch: Your outfit must have an “unnecessary element” — think a fairy with a beard or a ghost with a cowboy hat. It’s to call attention to the chain’s campaign to remove additives from its menu.

For those too old to trick-or-treat,Shake Shack‘s got your back. From Friday, Oct. 30-Sunday, Nov. 1,stop by the restaurant in costume and score a free single scoop of their Halloween-themed custard, the Shackenstein (marshmallow crème custard and frosted chocolate pieces).

Because after running a marathon you really can justify any calories, head toDewey’s Pub(135 W. 30th St.) and show your New York City Marathon racing tag on Sunday to receive a free pitcher of Bud Light for a celebratory round.