Freshers week can be overwhelming. During that week you have to register for your course and pay your course fees - otherwise you will not get your email id and access to the uni's virtual learning system. The rest of the week is up to you. You can go to every party going or pick and choose which events to attend. Certainly join one or two societies since they are great for socialising and making friends who are interested in the same things as you. There will be events organised by your course social committee - attend them since its great to meet people off your course. Then there will be events organised by the students union. Then there will be events organised by your halls of residence. You can choose to go to all or none. its up to you.