About a dozen Lawrence restaurants and bars are inviting customers to drink for a good cause this week.

Negroni Week, a yearly event presented by Campari and Imbibe Magazine, enlists the help of bars around the world to mix up their favorite variations of the timeless cocktail that traditionally features gin, Campari and sweet vermouth. For each Negroni sold at participating bars, a portion of the proceeds will go toward a local charity of the bar’s choice.

At Mariscos, bartenders are doing a standard Negroni with a splash of gin-barrel-aged orange bitters plus a garnish of “flamed orange twist,” all served with an extra large ice cube. (The restaurant is donating $1 per drink to Just Food; a few other participants said they hadn’t decided on a precise number.)

The Bourgeois Pig, John Brown’s Underground and 715 are all teaming up to benefit the Lawrence Humane Society by creating different twists on the drink.

715 will feature the classic Negroni all week long, with new variations offered each day. Tuesday, bartenders will be serving up The Jasmine (with rum and Cointreau orange liqueur). The next day, it’s the Perfect Sherroni (sherry instead of the standard gin, plus both sweet and dry vermouths).

On Monday, John Brown’s was serving a “New Orleans twist” on the drink, with Herbsaint and orange essential oil mixed in with the traditional ingredients. The bar also plans to add a new take on the drink for a $5 special each day this week.

Other Lawrence locations, like Genovese and The Burger Stand, are sticking with the classic recipe.

From now until June 7, you can stop by any of these local establishments for a refreshing Negroni — and a bit of positive karma (the local charity each location is benefiting is in parenthesis):

• 715 (Lawrence Humane Society)

• The Burger Stand (Lawrence Humane Society)

• Genovese (Help Nepal Foundation)

• Henry’s (Lawrence Humane Society)

• John Brown’s Underground (Lawrence Humane Society)

• Legends (Boys & Girls Club)

• Mariscos (Just Food)

• Minsky’s (March of Dimes)

• The Salty Iguana (Newhouse Shelter)

• Six Mile Tavern (Newhouse Shelter)

• The Bourgeois Pig (Lawrence Humane Society)

For more information on Negroni Week, including a full list of participants, check out the event’s website.