Hi @tpitman,
Do you want to know the events from 7 days ago? Or do you mean the last week as in starting from Monday?
In the first scenario you could use the EventDate column and compare it to utcnow -7. After that you can use a compose with a length function to count the number of items.
Below is an example of that approach.
1. Add a Get Items action. Use the Events list. In the filter query use
EventDate ge '@{addDays(utcnow(),-7)}'

2. Add a compose action. Use the following expression:
length(outputs('Get_items')['body']['value'])
