Hey cckat, regardless of feedback from your online application, an open day means just that "Open for anyone to show up" Global Assesment days are when you need an invite. I just turned up on an open day and made it through (starting training in a week or so) dont worry about your online application. If there is an open day you can attend, just turn up as long as you meet the requirments indicated on their website (height etc) and Goodluck
Cheers