First, add in your desired Custom Columns (Contract Subtotal and Event Start, for example) to your project list.

Then, use the Date Filters to select "Event Starts", and choose your desired time frame. For specific dates, click here.

Next, hover your mouse over the Contract Subtotal column to view the signed subtotal of all projects that had an event start in the time frame you select.

Want to download this report to Excel? You can download your project list (Article)