Show all Event Registrants in an EXCEL spreadsheet. Does JotForm have such a feature?

This is a deal-breaker... Please advise!

Yes, there are 3 ways to accomplish that:

1. You can view the submissions on a spreadsheet from the Submissions View:

http://www.jotform.com/help/269-How-to-view-Submissions

2. You can also download the data in Excel/CSV or PDF format:

http://www.jotform.com/help/44-How-to-Export-Form-Data-to-Excel

http://www.jotform.com/help/73-How-to-Partially-Download-Form-Submissions-as-Excel-CSV-PDF

3. Or you can embed an Excel report so others can see it:

http://www.jotform.com/help/101-How-to-create-an-Excel-Report