1. Does this happen in your dojo?
2. If the senior student doesn't do it (ie has to leave early OR just dosen't do it) does it fall on the second most senior, ect.?
3. Do you only fold the Sensei of the classes hakama? (Ie if there are two yudansha would my boyfriend and I each fold one hakama?)
At our school, who ever the available senior student is will fold sensei's hakama and everyone else folds their own; when senior students teach, they fold their own hakama.