The phrase "voluntary campaign" is grammatically correct and commonly used in written English.
It refers to a campaign or movement that is organized and carried out by individuals or groups who freely choose to participate, as opposed to being forced or required to do so. Example: The local community organized a voluntary campaign to clean up the park and raise awareness about environmental issues.
The city operates a voluntary campaign finance system.
On budget differences and voluntary campaign fund-raising limits: Ken, on the first part, this is the budget negotiation.
All but one of the 180 contributions Mr. Brach collected were for $175 — the maximum that the city will match under its voluntary campaign financing program.
New York has a voluntary campaign finance system, embraced by almost all candidates other than Mr. Bloomberg, that sharply limits spending by participating campaigns.
With 200,000 people taking part – just under a third are over 64 – Britain in Bloom is the UK's biggest voluntary campaign.
Now come troubling hints from Michael Bloomberg, the media billionaire, that he is thinking about running for mayor without participating in the city's voluntary campaign finance system.
Alone among possible candidates, he is unlikely to participate in the city's voluntary campaign-finance system, which he has called "an incumbent-protection programme".
There has also been a series of impressive voluntary campaigns and gestures, from Refugees Welcome – a scheme for sharing homes with those fleeing conflict and persecution described as "an Airbnb for refugees" – to a professional football club fielding a third team made up entirely of refugees.
But pacifism, like the Aid Spain movement or other locally organised voluntary campaigns, gave many people their first experience of participating in a new kind of grassroots politics, canvassing, demonstrating, producing posters, leaflets, badges, ribbons, making slides, staffing shops and collecting votes.
Public disgust led to a law establishing a voluntary public campaign financing system for state officeholders.
Nissan is conducting a voluntary service campaign to replace this part without charge.
