I know you're mainly asking for M2-3 experiences, but I'm an M3 and I went as an M1.
I didn't attend the med student section, but in retrospect, I wish I did. They had a whole program including round robin PD speed dating. They had a poster session. And I met a few residents randomly that gave me their cards without asking (so nice!).
If you do go this year, unfortunately, I think the scholarships deadline is over (but check anyways, I might be wrong). If you go next year, be sure to apply for those scholarships. The majority of non-local med students were being supported by them.