The Board of Selectmen has set Aug. 13 as the date of the special election on whether the town supports allowing a slot machine parlor at Raynham Park. Selectmen set the date at a special meeting June 13, two days after having voted unanimously to approve a host agreement with the track owner, Raynham Park LLC, regarding the proposed slot parlor. The host agreement, and a summary of it, are available on the town’s website, www.town.raynham.ma.us. Voting hours on Aug. 13 will be 7 a.m. to 8 p.m. The deadline to register to vote has been tentatively set for July 24. The state’s 2011 casino law allows for a single slot machine parlor in addition to three casinos. Any entity seeking to apply for a license must secure a host agreement and passage of a local referendum in favor of the facility. Under the host agreement, Raynham Park LLC would pay the town $1.1 million per year for the first three years, after which the annual payment would increase each year by 2.5 percent. George Carney, the owner of Raynham Park, and his partner Greenwood Racing, have proposed a new, 175,000-square-foot building, entertainment venue, retail stores, and restaurants, with up to 1,250 slot machines.