The city is holding two public forums to help inform the public about the proposal to bring a resort casino to Suffolk Downs, and the host agreement the city struck with the developers for the project. One of the meetings will be held Oct. 19 at 10 a.m. in the City Council chambers in City Hall. The other is Oct. 30 from 6 to 7:30 p.m. at the senior center, 25 Winthrop Ave. The city is also airing four pretaped discussions on various parts of the host agreement on RevereTV Channel 9 starting on Wednesday. The public outreach is designed to educate residents about the project and the host agreement in advance of the Nov. 5 referendum on whether the city supports the project. The referendum will be held on the same day as the city election. Suffolk Downs has partnered with Las Vegas-based Caesars Entertainment on the proposed $1 billion casino development at the track, which is located in Revere and East Boston. Revere and Boston both signed host agreements with the developers in August. Favorable referendum votes are needed in both communities for the developers to proceed with their application for a casino license.