The winner of this poll will resolve this market.

A single-vote poll isn't a great way to measure popular opinion when there are 18 options, so you can also show your support for your favorite sessions with a separate survey using approval voting (i.e. vote for any number of sessions that you think are deserving). Here's the survey.

Please don't vote multiple times. Honor system—there are no stakes to this result, & I didn't want to require sign-in (given some users preference for anonymity).