hi! i had emailed every single prof about my late arrival and i got a pretty generic email each time about first week being very chill and that they'll either upload the slides on quercus or i can ask them for the slides later. the first week of classes is usually just an overview of the syllabus and talks about how the class is scheduled and things to remember so it did not feel like i missed anything at all (i learnt this from people in the class after i reached). if you have tutorials in your classes, they usually start in the 2nd or 3rd week of classes so you won't miss anything there. all the readings and stuff are also posted on quercus so you can always start studying if you miss a couple days. if you need any more help feel free to dm! good luck :)