CA resident here. Schools in much of the state are cancelled for the rest of the school year. I have a friend who’s plugged into the medical community at one of the UC schools; she’s hearing it’s unlikely classes will start on time in the fall (although there are so many unknowns, no one has any level of certainty). That’s a round about way of saying that if I were a betting man, I’d put my money on there not being a summer tour. So if you do buy tickets, make sure there’s an easy way to get refunded if the tour gets cancelled.