If you don't have impressive things to put on a CV sure you put lectures.
If you do have impressive things they go first. Personal/Marital/Family, then Education, then Post Edu (Fellow, Intern, Masters/Phd, M.D.) Awards such as Pulitzer Prize
hey if you got one, list it.. Published Peer Reviewed Studies, Books you Authored (real books we can buy) Books you wrote Chapters in if the Book is significant (again, you might have put a Chapter in a book thats not even as impressive as a Research Study you did, its up to you to list it) THEN maybe, just maybe Lectures. If they are notable? If you were the featured speaker at the White House hosted by the U.S. Health Committee on Borderline Personality Disorder and how to spot it in your waitress or World Health Organization and you were the headliner on Vaccines & the relation to Autism well crap, put that baby down!
If you list Lecture after Lecture for pages on how to spot depression, when to seek help, when to suspect you have two personalities, when to suspect you have two personalities..you just look like you filled it with lesser quality items. The Surgeon I update the CV for lectures nearly once a month.. Once a month x 18 years is over 260 lectures. Um, no I am not typing them out in the cv.
I thought this was a brilliant day for the Prosecutor