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.
Did the Electric Light Orchestra perform in Hyde Park in September 2014?
Yes

Question: Was the show a success?
Self-contained rewrite: Was the Electric Light Orchestra's performance for BBC Radio 2 a success?