There was charity gambling in Maryland several years ago. According to an article posted on the www, Prince Georges count had charity gaming as late as 1997, and was attempting to resume it in 2005. A clip from the article:

Earlier this session, Prince George's County delegates voted for a bill to let volunteer fire stations and other charitable groups conduct casino nights as fund-raising events, with card games, roulette and - if the groups so desired - slot machines.

Casino nights had not been allowed in the county since 1997, according to legislative analysts. The Prince George's County Council could collect 20 percent of the proceeds as a tax under the bill, if the money were to go for public education.