I can 100% get behind the hesitation a small class would have with throwing a party for the following class if it was multitudes of times larger. The right thing ought to be for the previous class before the most recent one to pitch in and help, since they wouldn't have had as much to cover for their party. For instance, if class #6 had 60 new-hires, #7 had 12, and #8 had 52, Classes 6 & 7 could go in together for class 8's party.