Starting with the process of aggregating data from different sources.
The first step to build good data is to stop dirty data at the source with an extensive tool at all entry point.
A team of young professional working on documentation and make entry of every individual appearing in the events through the use of highly sophisticated tool.
These team make a list with all the entries and forward it to data compilation team(DCT).
Document all record made after email marketing(opt-in) and reach out dignitaries if they are interested in the event.
Also, the list which was accurate few years ago and need some update can make entry to data compilation tool(DCT).