I would defer to the commission to determine the number of debates.
I think it's important to make sure that people know how to tune in, and that this is a clear part of the process so that people aren't fragmented and miss a debate. There's also the replay functionality to be able to see the clips.
In terms of topics, having some nimbleness based on the live conversation is really helpful. We saw that play out in the U.S. presidential debate in November 2015, when a Twitter user sent a tweet, and that changed the entire course of the debate. The moderator was able to see that question in real time and pivot to address Hillary Clinton head-on, based on a user's feedback.