Hi,
It could help to attend this event. First, if you haven't attended an Open House at this school before, you may collect some useful perspective or insights, that you can incorporate into your re-application essay.
Secondly, you may be able to speak to the admissions/marketing rep about your profile to get more insight into the re-application process. As someone who used to work at a b-school in admissions and marketing, I would often talk with such candidates and give them informal feedback at these events.
Finally, you may be able to speak to some current students (or alums) to get their imput on how to strengthen your candidacy. While your attendance likely won't directly impact your admission chances, it does show continued interest and commitment to the school and you could pick up some helpful pointers.
Gopika
Expert Coach
Fortuna Admissions
www.fortunaadmissions.com