My organization hosts a yearly event and I am writing a report that shows guest registration. I am trying to write a measure that calculates how many people registered on this day last year. Any ideas?
You need to use time intelligence https://exceleratorbi.com.au/dax-time-intelligence-beginners/
If you want to calculate how many people registered on this day last year. In your resource table, there should be the people ID and registered date. Please create measure using the formula.
If this still don't resolve your issue, please share your sample table and list the desired result.