You can find details of social events and trips on the International section of the website, at www.beds.ac.uk/international/international-student-support/news-and-social-events, and download a PDF file containing an events calendar from the site. Trips are usually run to culturally significant English locations around once a month. Costs are generally payable in advance, in cash.
You can also follow the International Office on Facebook, or contact the events team at io-events@beds.ac.uk.