What to know about getting a COVID-19 vaccine in Montgomery County Walk-up lines, open appointments will be added when fewer invitations accepted April 23, 2021 | 8:53 am Silver Spring resident Tasha Harris receives her first dose of a COVID-19 vaccine at the vaccine site on Montgomery College's Germantown campus on March 31, 2021. File photo As the number of COVID-19 vaccination appointments increase in Montgomery County and the number of residents signing up for a dose decreases, the county is considering ways to make it easier for remaining residents to get a vaccine. The county is beginning to see fewer vaccine appointment invitations accepted over the last week.