A few weeks after the Leavers' Fair you'll recieve an email to ask you to activate your My Oxford Online account.
This account will allow you to manage your communication preferences, claim discount offers and access alumni benefits such as JSTOR. (You can check your eligibility here.)
If you weren't able to make it to the Leavers' Fair to collect your 'My Oxford' alumni card, you'll also be able to order one via your online account.