Preparing for my first Superday, not sure what to expect

Hey all, I had an interview with Wells Fargo last week for a corporate banking summer analyst position for next year and to my surprise I got invited to the superday, which they said in the invitation email is the final round. In the email I was told that it would consist of two 30 minute interviews, however beyond this I am not sure what I should expect as I have never made it this far in the interview process before.

My first interview consisted of a bunch of behavioral questions and few technicals that accessed my understanding of some pretty basic accounting knowledge. I expect them to ask more questions along these lines in greater depth during the superday, but I'm not sure to what extent. Beyond that I really don't know what to expect. Any advice and/or experience would be appreciated here as I know it's quite late in the recruiting cycle and this is likely to be my only shot at securing an internship with a decent bank next year. Thanks.