Liability Insurance is required. If you have a business insurance policy that includes liability, you can call your agent to request a COI with the following listed as Additional Insureds:

The following entities must be endorsed as Additional Insured on all policies: 
Tiny Fest, LLC
Address: PO Box 38, Umpqua, OR 97486

The State of California, The District Agricultural Association, County Fair, The County in which the County Fair is Located, Lessor/Sublessor if fair site is leased/subleased, Citrus Fruit Fair, or California Exposition and State Fair, or Entities (public or non-profit) operating California designated agricultural fairs, their directors, officers, agents servants, and employees are made additional insured, but only insofar as the operations under this contract are concerned. 
Address: 88 Fair Dr., Costa Mesa, CA 92626  The business address for Tiny Fest, LLC is

The minimum coverage required is Commercial General Liability coverage of $1,000,000 per occurrence. The event dates, including set-up and tear-down, must be listed. The event dates, including set-up and tear-down, must be listed.

If you don't have business liability insurance, you can purchase a short-term policy from ACT. They primarily cover Artists, Craftsmen, & Tradesmen, so their system lacks a designated option for Tiny Homes, ADUs or Van Conversions. Choose "Art" to move forward through their system. They already have the needed info about who to insure and for how much. 

Insurance link: https://app.actinsurance.com/events/5471

Use code TinyFest5 for 5% off