I would go along if I was you, I attended an open day a few weeks back and have had a call asking me to come back for an interview in 2 weeks. I too applied online months ago and have heard absolutely nothing. Like you said before I thought it was worth going along so that they could see what I had to offer, online applications don't always give them a true picture!
Another piece of advice, I arrived at 0730 for a 0900 start and was prob about no.200 in the queue! By 0830 there were so many people I think they may have turned some away. Make sure your CV is professional and put your d.o.b on it, I didn't and they had to write it on! Also take a head shot and full length pic, although it states on the website they just want a passport pic, I have noticed in magazine adverts that they ask for both.
Anyway good luck I've got my fingers crossed x