A single person is propping up LTC, so it's not like it would take some kind of elaborate scheme.
I suspect someone is propping up the price by placing the massive bid walls with his fiat while at the same time selling his remaining BTC at the artificially propped up price. When someone buys BTC at this level a seemingly never ending supply of BTC is put straight back into the asks at very similar if not identical prices.
I'd be surprised if this is related to the conference in any way.
When this whale has sold enough of his coins the bids will disappear and he will dump the remainder creating a free fall so he can buy back cheaper and repeat the whole process.
For example, take the last 5 days. The bid and ask walls are still there and look about the same size to me. Yet somehow within the confines of these walls nearly 150,000 BTC have changed hands. During that time the price hasn't changed that much. Nearly all of these BTC that have changed hands were not part of the solid 'walls' so they are being traded within the confines of the 'trap'.
Just a theory of mine.
The longer the price stays here, the harder it is to "dump". That's why you "pump" then "dump". You push the price up to a level where people believe it's higher then it should be. Making it easier to push back down (people panic sell, people take profit).
The bid side is well within normal ranges, when you factor in the low volume. Speaking of the volume, 150k coins traded is less then normal. I looked at the times the bid orders were placed, I don't see a spike in bid orders in a small timeframe.
I have my doubts the "stability n dump" strategy is going on, or would even work very well.