Cal. Pub. Cont. Code § 6610

Notice inviting formal bids for projects by a public agency that include a requirement for any type of mandatory prebid conference, site visit, or meeting shall include the time, date, and location of the mandatory prebid site visit, conference or meeting, and when and where project documents, including final plans and specifications are available. Any mandatory prebid site visit, conference or meeting shall not occur within a minimum of five calendar days of the publication of the initial notice. This provision shall not apply to the Regents of the University of California.