The National Count of Mass Attenders will continue in all Catholic dioceses and parishes throughout Australia over four consecutive Sundays (and Saturday evenings) in May 2021. It will be a simple headcount: no other information about individual attenders will be collected. The exercise is done while the collection is being taken up. Please note that some basic demographic information about Mass attenders will be collected in the third and fourth weekends of May. The information collected can be used in association with the results from the Australian Census (to be held on 10 August 2021).