They are sharing the virus!
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To me the biggest concern isn't masks but the "a lot", as it seems everyone is present. (And shaking hands; seriously??)
Already during the spring many parliaments made steps to reduce the number of persons present, and/or move to virtual meetings, as any sane place of work where physical presence isn't required. I understand the supreme court in the US also did that, but it seems many legislatures in the US didn't.
I couldn't find a good list - but some Israeli did a survey: https://ial-online.org/wp-content/up...s-Pandemic.pdf