. >> reporter: phil ginsburg the director of the san francisco rec and parks department is asking participants to be mindful of others and the environment. >> our task is to try to, um, mitigate and remediate the impacts of 12,000 to 15,000 people showing up. >> reporter: the sfpd says additional security will be in place to keep an eye on what's happening in the area. >> i'm very confident that regardless of the numbers of people who come here, we are going to be successful at what we do. we'll keep everybody safe. >> reporter: while recreational marijuana is legal in california, it's still illegal to smoke it in public. so there will be an exception for those people who are inside the fencing at hippie hill. but for everyone else, there is no exception to the law. in san francisco, jackie ward, kpix 5. >>> there will be no drugs for sale, no alcohol will be allowed, and this is still not a city-sponsored or city- approved event. only people aged 18 and older will be let in. >>> a family in san jose is now homeless after a fire started this morning. it started at about 5 a.m. at a home near h