“Blindspotting” co-creators, stars, producers and writers Rafael Casal and Daveed Diggs hosted the second of their semi-clandestine writers salons for Bay Area storytellers looking to break into film and TV writing. Casal spoke with Bay City News about how the salons came about, what they hope to achieve and, as “Blindspotting” Season 2 on STARZ approaches, how important it is for Baydestrians to harness their own stories.