As of March 1, 2022, the City of Baltimore rescinded its indoor mask mandate. See the Press Release.
Use this link to check Baltimore City’s COVID-19 Community Level: https://www.cdc.gov/coronavirus/2019-ncov/your-health/covid-by-county.html
Reference CDC’s guidance on wearing masks:
We want all conference attendees to feel comfortable. Please consider yourself and others when deciding precautions to take. All are welcomed to wear a mask.