Conversation so far:
what event took place in London with Michael Phelps on July 28, 2012?
The morning prelims for the 400-meter individual medley
what did Michael Phelps place after the morning prelims for the 400-meter individual medley?
Phelps placed eighth
was the London 2012 morning prelims for the 400-meter individual medley a record breaking time for Phelps?
He won his heat in 4 minutes, 13.33 seconds with a time that was well off his world record of 4:03.84 set four years ago in Beijing
was the morning prelims for the 400-meter individual medley competition at the olympics?
Yes, London 2012 Summer Olympics

Question: what other events did he participate in during this Olympics?
Self-contained rewrite: what other events did Michael Phelps participate in during he 2012 Olympics besides the morning prelims for the 400-meter individual medley?