CA Bus & Prof Code Section 18884

(a)

A promoter may, but is not required to, add to the price of each ticket sold for a professional boxing contest, an amount specifically designated on the ticket for contribution as a donation, either or both, to the pension plan established pursuant to Section 18881. The additional amount shall not be subject to the admissions tax required by Section 18824 or any other deductions. Nothing in this section shall authorize the addition of such amounts to less than all the tickets sold for the professional boxing contest involved. The promoter shall pay additional contributions collected in accordance with Section 18881.

(b)

Any additional contributions received pursuant to this section shall not be considered to offset any of the contributions required by the commission under Section 18881.