The presence of EU flags at the Proms, particularly on the Last Night of the Proms, is largely due to a pro-EU campaign group called "Thank EU for the Music." Since the Brexit referendum in 2016, this group has distributed thousands of EU flags at the event to counter what they see as jingoistic celebrations of Brexit. The flags are intended as symbols of solidarity with musicians and performers who have been adversely impacted by Brexit, as well as to celebrate unity, peace, and inclusivity through music, which is considered a universal language transcending borders. The EU flags have become a regular fixture at the Proms, especially during the last night, with many attendees waving them alongside or sometimes outnumbering Union Jacks. Though the Royal Albert Hall has rules against protest flags, the EU flags have generally been allowed, and their visibility has led to ongoing political debate and media coverage. Supporters argue the flags represent solidarity and cultural unity across Europe, while critics see them as provocative or political statements at a traditionally British event. In summary, EU flags are at the Proms because a campaign group actively distributes them to promote a message of European unity and support for musicians affected by Brexit, making the flags a notable part of the event's modern traditions and controversies.