One of the nice things about the Society of American Archivists Annual Meeting is they encourage attendees to comment on particular sessions by tweeting with the #saa15 hashtag along with a session specific hashtag (e.g. #s405), and these session numbers have web pages.
So given this behavior it's possible to collect the #saa15 tweets and count up how many times each session was tweeted about. Here are the final results generated from 18,796 tweets on Sat Aug 22 at 13:05:56 EDT 2015. The program and data I used to generate the table can be found below.