Good morning, Bay Area, and welcome to 9/11. San Francisco is closing down Howard Street between Third and Fourth streets starting today in preparation for Salesforce's Dreamforce conference, which kicks off tomorrow. Want to know who and what to expect? Reporter Sara Bloomberg has a preview. Also in Salesforce news, the tech titan announced Monday that it's giving San Francisco and Oakland public schools each $5.5 million to prepare students for careers in AI, an area Salesforce has recently been…