So 15 person games - BZFlag comes to mind, if you get shot you respawn so no one is on the sidelines. - If people are not into shooters you might consider som

So 15 person games - BZFlag comes to mind, if you get shot you respawn so no one is on the sidelines. - If people are not into shooters you might consider some virtual world activities like something on Second Life or other virtual world simulator.