I've played in a few RPGs at Origins, but these days (like, the last 10 years) I've been running the wargaming program there, so it's all tabletop wargaming all the time for me anymore.
That said, if you want a cool RPG/wargaming crossover, check out our Command Post Exercises, which are a co-op event where the players are running a command post during a battle while our team offer some coaching on how to do it. You learn the different roles in the command post, work up a plan for your mission, and then the game starts. And on turn 2, when the plan goes to hell, our coaches will look at you and ask "OK, commander - now what?" as you adjust on-the-fly from there.
4 hour event and seats still open for WED night, THU/FRI both mid-day.