“The things we had to consider were typical health and safety, and effective placement (breathing height, multiple monitors for multiple spaces, not near windows/doors),” a Kawaiicon spokesperson who goes by Sput online told WIRED over email.

“To be honest, it is no different than having to consider other accessibility options (e.g., access to venue, access to talks, access to private space for personal needs),” Sput wrote. “Being a tech-leaning community it is easier for us to get this set up ourselves, or with volunteer help, but definitely not out of reach given how accessible the CO₂ monitor tech is.”

Kawaiicon’s attendees could quickly check the conditions before they arrived and decide how to protect themselves accordingly. At the event, WIRED observed attendees checking CO₂ levels on their phones, masking and unmasking in different conference areas, and watching a display of all room readings on a dashboard at the registration desk.

In each conference session room, small wall-mounted monitors displayed stoplight colors showing immediate conditions: green for safe, orange for risky, and red to show the room had high CO₂ levels, the top level for risk.

“Everyone who occupies the con space we operate have a different risk and threat model, and we want everyone to feel they can experience the con in a way that fits their model,” the organizers wrote on their website. “Considering Covid-19 is still in the community, we wanted to make sure that everyone had all the information they needed to make their own risk assessment on ‘if’ and ‘how’ they attended the con. So this is our threat model and all the controls and zones we have in place.”