As an organisation you should not need to choose between having a system that records secure GDPR-compliant personal data about your beneficiaries and a practical system for keeping track of the anonymous numbers you need to collect e.g. for event attendees.
How Makerble Helps
Post updates in which you tag individual beneficiaries
And in the same update, add numbers of Anonymous Contacts and split them by demographic group if you wish, e.g. showing the age, gender, ethnicity splits etc