henry copeland:

Key to great "Harvard sucks" prank was failure and new recruits

Unfortunately, many of their original collaborators from the year before were discouraged by the original plan's untimely demise. According to Kai, a new group of Yale students was recruited for the prank at Harvard Stadium. "Most of the people who helped us our junior year didn't want to help senior year, after seeing the failure," Kai told Business Insider. "So it became a mix of close friends and freshmen, who hadn't seen the failed plan."
- www.businessinsider.com