If you are looking for the history of an enacted law, you will need the bill number or statute number. You can find these in an annotated California Code.
The bill history will indicate which committees were involved and if hearings were held. Histories also indexed by author and subject.
The Final Histories will indicate if hearings were held in connection with the bill. Not all hearings are published. For more in-depth guidance refer to the California Legislative History Research Guide from UC Hastings.