Some participants ask for a list of the people who sponsored them from the previous year. Since the old participant pages are offline you'll need to rely on the Participant Summary Sheets.
Even though the page is gone, you can still access these Reports from the Column Browser or from Reports in the Event Tools menu in any of your past events. You can print them and snail mail them to your participants, or if your browser can print files as a .pdf, you can create individual .pdfs that you can email to each of your participants. Chrome, Safari, and Firefox for Mac have built in .pdf options in the print screen. Windows computers will need to use an app to add PDF ability to Firefox or Internet Explorer.
Currently there is no option to batch email these summary sheets.