The Union has a big grass area behind the main building, which never gets used. It would be a great space for events.
Update 9th January 2021: named the space as the FiEld. It's now on the room booking system, allowing societies to book it for events like they would any other Union space. Since September, it has been used by A Cappella Society for rehearsals, and by Charities Campaign for a tie-dye event. As of December 2020, the FiEld has a Public Entertainment Licence, allowing larger events to take place.