Anti-fall Tai Chi Qigong for Seniors - Ongoing classes for elders help improve balance and coordination. By donation. Mon at 11. Mill Valley Community Center, 180 Camino Alto, Mill Valley. Tues at 1. Marguerite Johnson Senior Center, 640 Drake Ave, Marin City. Wed at 9. Whistlestop Wheels, 930 Tamalpais Ave, San Rafael. Wed at 2. Maria B Freitas Senior Community, 455 Manuel T Freitas Pkwy, San Rafael. Thurs at 1. 415.383.9443.