Face masks and sanitizer for attendees will be the new swag at conferences or at least another line item in the budget.

And when in-person conferences are available wondering if “packing a room” will be discouraged.

Give yourself a "buffer seat” by placing your bag or personal item. Before it was inconsiderate, now it’s understandable or even appreciated.

For a while perhaps organizers would have to plan for PLENTY of room for attendees for a physical space. Literally cut your attendance limit by half for the same space.

Conference food: Everything would need to be wrapped (bagels in plastic wrap) or boxed (lunches). Even a stack of empty coffee cups would be problematic (bring your own mug/bottle).

Buffets (popular at after parties) wouldn’t be a social norm for quite some time.

For a while even if an in-person event is “safe” having it live streamed will still need to be more important than ever for accessiblity reasons (elderly or autoimmune would still prefer watching online most likely and they wouldn’t be able to ask questions/interact otherwise)?