Many doors on major academic buildings are set to open automatically during the day, and then lock off for access control in the evening and at weekends or during holidays.
If you would like certain doors to open automatically at specific times for an event, then you will need to email the University Card team with at least seven days notice. 
You will need to be very clear on the building, doors and timings that you would like to alter, as well as providing details about yourself for verification and a full explanation as to why you would like the door unlocking.
If you need to book a building attendant for out of hours building cover, you will need to log an Estates Helpdesk online works request.