UC San Diego will be one of the sites for a national COVID-19 vaccine trial slated to begin Monday. Local sites are looking for more than 1,000 San Diegans to sign up. The trial is based on a vaccine prototype developed by Massachusetts-based Moderna Therapeutics. Plus, in San Diego, police officers are often the ones responding to mental health-related 911 calls. We’ll hear about a plan to change that. And, KPBS Arts Calendar Editor Julia Dixon Evans has a preview of this weekend’s top events, beyond Comic-Con@Home.