Actually, you can't advocate from the mayor's office without spending money. It costs time and lobbyists. If you expect the arts to be a priority in this budget crunch, when we can't even fund Basic Health, you will have to make the case with a lot of grassroots support.
Most people have no idea who they are, actually.
Arts jobs generate more revenue in the county that professional sports.
Would that be "grass roots" enough for you?