So if California mails out ever single ballot do the local polls close? If not what's stopping ppl from voting twice? If so how do people vote whose ballot got lost in the mail or who refuse to use the mail in ballot system?

Seriously people. There isn't going to be an election this year. The deep state and the communists know it. That's why they don't care about public perception. They are going to delay in the courts until time runs out and they will attempt to install Pelosi.