Organizing talks is an art, and as such, it can be lots of hard work, as well as plenty of fun. But since it happens bit by bit you can only see how hard you've worked with hindsight. I've organized six years of talks at Nuance Sunnyvale Lab, 202 talks, in total, I believe.
Sure, lots of other people helped too, but I think most of the work was actually mine. There were times that I thought it was a waste of time and thought I'd stop doing it. But I really enjoy listening to engaging talks, and I do have plenty of very engaging friends, so I usually went back to organizing it. Most of the talks were academic and about stuff already published. I do not have the abstracts or slides for most of the talks, so I hope none of the presenters will be offended that in the attachment there is simply a spreadsheet with their name and the titles of the talks.