If you need to change a personal fundraiser's description as it appears on Evite's invitations, you can do that at Evite.com

On the Evite event setup page, where you originally set the name, date, and time of the event, go to the "Donation Options" section on the right side and click on "Edit:"

Now you can change the Fundraiser Name (in this example, the misspelled word "Benifit") and the goal: