Artists' organizations in Newton, Lexington, and Somerville have all cancelled their Open Studios events that were scheduled for April and May weekends this year. Lexington's statement explains:
The specific nature of LOS -- built upon guiding hundreds of visitors from location to location, to mix at dozens of homes and institutions across Lexington, makes us an even greater exposure risk than single-site events.
Somerville Open Studios would like to reschedule for July, and Lexington for October, but nobody really knows yet whether these are realistic hopes. Newton does not plan to hold an Open Studios event in 2020 at all anymore.
Disclaimer: I am one of the volunteer webmasters for Somerville Open Studios.