Conversation so far:
What happened with the Electric Light Orchestra in 2014?
The 50,000 tickets for the BBC Radio 2's Festival in a Day, featuring Jeff Lynne's Electric Light Orchestra, in Hyde Park on 14 September 2014, sold out in 15 minutes.

Question: Did they perform at Hyde Park in September 2014?
Self-contained rewrite: Did the Electric Light Orchestra perform in Hyde Park in September 2014?