I'm very curious to see what Hana has in store for us. That said, I hope she doesn't wind up overshadowing the other girls. Hana's very easy to like and she has a very prominent role in both aspects of the MC's life. But the others need their time to shine too. Not trying to worry over things that haven't actually happened yet and I'm definitely not asking for less Hana. I'm just noting that she never needs to sit an update out.
I too, am very curious, what the, according to TD, faily important event or events for Hana are. I theorise that it is an event where we as the MC will have the choice if Hana gets "corrupted", where she can gain full corruption for the event, no corruption or a bit corruption for more fun in the sheets, but not elsewhere. Could be that Kat uses the event and Hana´s appearance to try something, could be that if it is a lesser thing August wants to see if Hana has the "backbone" to be a shareholder. In case of the latter it might also include helping repair (or not) the strained relations of august and Hana.
Independent or entwined the important happening can also have influence on the Hana-MC relationship, maybe we will have the choice how the relationship between the two develops. If it deepens towards (dedicated) lovers, stays the same as good friends, deepens towards very good, but more platonic friends or if not following the Hana path, starts at all or is closed off.
TD would not have written that there is important Hana stuff in the update, if it would not be so. So while I simply theorise a bit, it must be about one or more of the following: Hana and MC relationship, Hana´s corruption and anger and/or Hana´s role in the club as August´s possible successor and the father-daughter relations.
Or TD and GIl throw us a curve ball with an important event we had no idea it was coming.