I want to keep this updated in case someone else wants to try to set up an event like this. Here is the initial response I got from CA's ABC. I think they are mis-understanding what I am trying to do.
Home beer manufacturers may brew a limited amount of beer for personal or family use per Section 23356.2 of the Alcoholic Beverage Control Act. Here is the full text of that law:
23356.2. (a) No license or permit shall be required for the
manufacture of beer for personal or family use, and not for sale, by
a person over the age of 21 years. The aggregate amount of beer with
respect to any household shall not exceed (1) 200 gallons per
calendar year if there are two or more adults in the household, or
(2) 100 gallons per calendar year if there is only one adult in the
household.
(b) No license or permit shall be required for the manufacture of
wine for personal or family use, and not for sale, by a person over
the age of 21 years. The aggregate amount of wine with respect to any
household shall not exceed (1) 200 gallons per calendar year if
there are two or more adults in the household or (2) 100 gallons per
calendar year if there is only one adult in the household.
(c) Any beer manufactured pursuant to this section may be removed
from the premises where manufactured for use in competition at
organized affairs, exhibitions or competitions, including homemakers'
contests, tastings, or judgings.
(d) Any wine made pursuant to this section may be removed from the
premises where made for personal or family use, including use at
organized affairs, exhibitions or competitions, such as homemaker's
contests, tastings or judging. Wine used under this section shall not
be sold or offered for sale.
(e) Except as provided herein, nothing in this section authorizes
any activity in violation of Section 23300, 23355, or 23399.1.
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For reference, I have also included the text of the statutes referenced above (23300, 23355, and 23399.1), as follows:
23300. No person shall exercise the privilege or perform any act
which a licensee may exercise or perform under the authority of a
license unless the person is authorized to do so by a license issued
pursuant to this division.
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23355. Except as otherwise provided in this division and subject to
the provisions of Section 22 of Article XX of the Constitution, the
licenses provided for in Article 2 of this chapter authorize the
person to whom issued to exercise the rights and privileges specified
in this article and no others at the premises for which issued
during the year for which issued.
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23399.1. No license or permit shall be required for the serving and
otherwise disposing of alcoholic beverages where all of the
following conditions prevail:
1. That there is no sale of an alcoholic beverage.
2. That the premises are not open to the general public during the
time alcoholic beverages are served, consumed or otherwise disposed
of.
3. That the premises are not maintained for the purpose of
keeping, serving, consuming or otherwise disposing of alcoholic
beverages.
Provided, however, that nothing in this section shall be construed
to permit any person to violate any provision of the Alcoholic
Beverage Control Act.
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Based on the above statutes there is no privilege for a home brewer to do what you have proposed. Furthermore, if you want to exercise the privileges of a small beer manufacturer or an on-sale licensee then you must hold the appropriate ABC license. There is no temporary permit available to you to perform any of the tasks you mentioned.