May Morning sees thousands of people gather at dawn to listen to choristers sing from atop Magdalen College's Great Tower.
The event, which marks the coming of Spring and is unique to Oxford, has been taking place in the city for more than 500 years.
Magdalen College's choristers sing Hymnus Eucharisticus, which was composed in the 17th century by a Fellow of the college and has been sung on May Morning ever since.
This will be followed by the Great Tower’s bells ringing out over the city for approximately 20 minutes.
Events and activities, including Morris Dancing and folk singing, will then take place across the city.
For information about all the events taking place during May Morning, please visit: www.dailyinfo.co.uk/mayday
PLEASE NOTE: This year's May Morning will feature a new crowd management system on Magdalen Bridge.
The new system will see one-way channels created on Magdalen Bridge to enable the crowd to flow during and immediately after the event.
People will not be allowed to stop in the channels, and stewards and signs will be in place to direct people to areas where they can stop and view the event.
If capacity is reached on Magdalen Bridge, stewards and barriers will be used to stop any more people from accessing the bridge from the west and east.
For the first time, bicycles – including those ridden and pushed – will not be allowed to cross Magdalen Bridge during the event.
Designated viewing areas for wheelchair users, families with young children and those with buggies will be also available for the first time, in the car park of Magdalen College School and in Rose Lane.
Last year, immediately after the event finished, those wishing to leave the event towards East Oxford encountered an unusually high number of people wanting to come into the city from the Plain Roundabout, and an impasse ensued on Magdalen Bridge.
The aim of the new crowd management plan is to ensure that does not happen again.
May Morning at Magdalen Bridge is organised by Oxford City Council on behalf of partners, including Thames Valley Police, Oxfordshire Fire and Rescue Service, South Central Ambulance Service, Oxfordshire County Council and Magdalen College.