FWIW, it hasn't been worth going to OLS in about three years. All the good papers are submitted elsewhere these days.
I live in Ottawa, about ten minutes walk from the conference venue, and I couldn't be bothered to go to the free day this year. It genuinely wasn't worth my time. I did appreciate the opportunity to get together with some of the attendees after-hours though :-) [Yes, in a pub. Even though I wasn't drinking. See other comment.]