Volunteer to visit dad in memory care

We recently moved my 89 year-old father from Assisted Living into Memory Care. My mother recently passed and they had been living together. My dad has no short term memory but is social and can carry on a decent conversation, especially around sports, science or politics. We'd like to have someone, preferably a man, to visit him once a week to talk. He likes the stimulation. Does anyone know of a service - we are in Santa Clara County, CA. Thank you!