Events (leisure): What would you think of a conference that had longer hours?
My answer to Events (leisure): What would you think of a conference that had longer hours? on Quora
I agree with Lenny Martin, for most events this would just be too long. There’s one exception: events that provide a sit-down dinner and have a talk during that dinner. PyCon UK in Birmingham have done this in the past and it was great—the conference itself ended around 6pm, you have an hour and a half to yourself, then you sit down for a banquet-style meal at 7:30pm with the other attendees. Their dinner speaker was a local historian talking about the science history of the local area, which was a really nice complement to the rest of the conference.