Anybody selling right now is going to regret it in about 2 weeks time. The Bitcoin conference alone isn't necessarily enough to push the price up a lot, but the strong correlation between Google trends and BTC exchange rate is too strong to ignore. If just half of the people attending the conference make a decent report on it the amount of interest in Bitcoin is going to go through the roof.
Interseting thought as I have been purchasing and selling coins on a regular basis while mining I had just sold most of my coins before the conference in case something comes out that makes it not appear as attractive. Of course I hope I'm wrong which is why I have kept a good amount just not nearly as much as I was holding before so I could lock in the gains.