Mature adults can make decisions on their own, particularly when it comes to mundane matters. If there are halachic issues involved, then we can sit down and study them, either on our own or with a Rav. Who would object to more Torah study?
It’s unfair to the gedolim to consult them for every BY play or other small event. Ten minutes of one’s time may not be a lot, but what about the gadol who has to spend ten minutes listening to every Chani or Rochel out there? I for one would not want to be the one to distract him from his Torah learning and everything else he does for the community unless it was an urgent matter that desperately needed his attention. Does a play or Chinese auction really qualify?