I ended up getting much further ahead in my playthrough. The part I'm stuck at now is the swimsuit section. I just can't seem to acquire any swimsuits. I have tried searching Hermione on every day of the week and I've tried talking to Luna without official summons many times as well. I also can't seem to trigger the event where I visit all the dorms with McGonnagal.
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there is no event triggered by visiting all the dorms (at least not that i remember). The swimsuit section is the most annoying part in Act 1. You first have to grab Hermione's favourite swimsuit, then you need to steal a swimsuit from each girl (doesn't matter if it's their favourite or not). After you've given each girls swimsuit to the sorting hat, you need to go to the sorting hat and ask him to create different versions of Hermione's favourite swimsuit for each of the other girls. Once that's done, you place the girls respective version of hermione's swimsuit on their laundry line, you also need to steal each girls favourite swimsuit. Remember you need to do this in one in=game week. Refer to your journal's note section for which swimsuit appears on which day. Refer to the google document for a more extensive guide.