Organizers say the two-day event, which began Saturday at 10 a.m., is intended to showcase the state's multibillion dollar pot industry and educate people about the drug's uses.
It is open to the public from 10 a.m. to 6 p.m. on Saturday and Sunday. Organizers say vendors connected to the industry will be on hand. There will also be an area where medical marijuana patients can smoke.
Bob Katzman, chief operations officer for the event, said organizers insisted on having an onsite medicating area before holding the expo.
The event comes as California voters head to the polls in November to decide whether to legalize marijuana.