What information/questions do you see being required on your registration pages now? i.e. "please list all countries/states you have visited in the last 2 months"?
How much can you ask without breaching GDPR or other privacy and data laws? And how long would you want to keep this information?
Is it also something to consider as to how much of the common T&Cs we will have to scale up to have delegates approve of individual elements? "Your temperature will be checked on site" "You will not be granted access if you are displaying symptoms" etc...?