Today I ran two Dark Heresy demo events at 4 hours each using the Jurisdiction scenario.
The first event was full, and had a good group of players. It's nice when some of your GM energy gets reflected back at you
and everyone seemed to have a smashing time (in some cases literally).
The second event was more sparsely attended (half full) and the players were much more reserved. It took far more work on my part to "trick" them into relaxing and enjoying themselves. I finally got everyone in the groove during the climax scene, so everyone left happy, though they lost some of their party at the end.
Tomorrow is a 12-hour extravaganza - Part 2 of my Emperor's Heart Campaign , previously run for the first time at GenCon '08. I got some excelent insight into possible improvements at that time, so I'm really looking forward to seeing how it turns out.
There are several other GMs running Dark Heresy at the con, and it looks like the events are pretty much sold out within minutes of registration opening so the game seems to be doing very well in the area.
More tomorrow after I have a chance to sleep...