The San Francisco Department of Public Health is holding an H1N1 Swine Flu Mass Vaccination Clinic on Dec. 22 at the Bill Graham Auditorium to offer free vaccines to high-risk priority groups.  The event is from 10 a.m. to 7 p.m. Don’t know if you’re at risk? 

The unlucky groups include pregnant women, children six months and older and young adults up to 24 years of age, health care and emergency responders and adults with medical conditions that put them at risk from influenza.