Sorry to hear that. This is something that occurs across the whole of the Internet - hitting backspace or clicking ‘back’ will take you to a previous page and you'll lose your work.
Our suggestion is to copy and paste your event title, short description and long description from an email or word document, so that you won't lose it (and if you do, you can easily copy and paste it in again).
If you need more help submitting your event, you can buy one Simple Submit credit and we will create the event for you.
At the moment, it isn’t possible to save your draft event listing. This is something that we are working on for the future.