Conversation so far:
what took place in London?
On July 28, 2012, Phelps placed eighth in the morning prelims for the 400-meter individual medley.
what did he place after that?
Phelps, the two-time defending Olympic champion, won his heat in 4 minutes.
was this a record breaking time?
13.33 seconds with a time that was well off his world record of 4:03.84 set four years ago in Beijing, when Phelps won a record eight gold medals.
who were other competitors in this competition?
He out-touched Laszlo Cseh by 0.07 seconds in his heat to qualify last for the final.
was this competition at the olympics?
In his first finals of the Summer Olympics.

Question: what other events did he participate in during this Olympics?
Self-contained rewrite: Aside from the 400 meter medley, what other events did Michael Phelps participate in?