The owner of any professional sports facility shall post, visible from a majority of the seating in the stands at all times, at controlled entry areas, and at parking facilities that are part of the professional sports facility, written notices displaying the text message number and telephone number to contact security in order to report a violent act.
Source:
Section 243.85, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=PEN§ionNum=243.85..