Many years ago I was overseas when I received an invite from Virgin Blue. I was unable to make it and sent an email saying as much. I received the usual 'we're sorry you cant attend' reply. About 2 weeks after I got back in the country I was invited to another seminar. I think I was just lucky that they were running another seminar then, and it would depend on whether Jetstar is going to run another one after your friend returns.