Filmmaker Deborah Craig will introduce a screening of her award-winning film “A Great Ride,” a 30-minute documentary about Bay Area lesbians confronting the challenge of aging with determination, dynamism, courage and humor. The film follows Sally, a retired women’s studies professor and activist living in a cabin in Northern California; Brenda, an African American political activist in Vallejo; and five residents of a Santa Rosa retirement community: two couples, Nancy and Marjorie and Sue and Patty, as well as Shirley,…