how to show missing data in a table

I need to show a visiting report.

The data includes:

customer name

project name

visiter

date of visit

I made a pivot table chart with the dimension:

customer name, project name, week (from date)

the expression is "count (date)" - in order to count how many visits were there at each project in each week.

Only I want to see not only the project that were visited, but the projects with no visits at that week.

How do I do that?