Nearly 10 years old yet this post is as relevant as ever. (How often is that said, in this day and age?!) In addition to the insights in the original post, part of g's comment here bears reiterating for it is profoundly wise advice:

"Lastly, how you present the purpose of the meeting is important. If you say, 'this meeting is about fixing the test suite' then people are thinking about how it’s broken. Not that this isn’t necessary, but you allow people to think a lot more broadly and innovatively if you frame it as 'this meeting is about making the test suite more stable.' Rather than presenting problems, present possibilities."