To access the calendar of events, you need to either be logged in with Raven (if you're a current member of the MCR), or to login below using the Freshers' username and password.
This login will be (or has been!) sent by the Tutorial Department. If you can't find what it was, send them an email. They will verify that you are a Fresher and resend you the password. (Do bear in mind it's a very busy time for them at the moment.)