To beatthecrowds, get an early start on your first day by staying overnight at mountain station Kleine Scheidegg, the departure point for the Jungfraubahn, and catch the 8 am train.
In addition, I have a couple of friends from the New York the financial sector who have now gone annually for twelve straight years, often entertaining clients, and have developed special strategies for how to beatthecrowds and do the event right.