If you don't yet have a seller's permit, you can register for a temporary one by clicking HERE, which will take you to California's Department of Tax and Fee Administration. Signing up is relatively easy (for government work) and the only step after registering is to file your return through the same web page within the month that the temporary permit event day ends. If you left the above entry asking for your permit number blank, CarrierCon's team will be following up and may cancel your Artist Alley registration if you do not provide it.