yes that date for the second campus may be delayed due to bad weather
you should try to miss as less classes as possible
if you are planning to attend the classes more than 10 days after the commencement of classes then you should give a request letter for that in writing otherwise if you continue to miss your classes after that your admission might be cancelled
upto one week is okay but dont linger it too long
it wont affect your studies that much but make sure that when you come you come here you are strong and sound for studing continuously and dont worry as many students do that
you might also have to arrange for your accomodation